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Numerical Investigation of the Load Distribution between the Main Blade and the Splitter Blade in a High-Loading Centrifugal Compressor

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Journal of Thermal Science 2022年第5期31卷 1682-1695页

作者： OU Jun JIN Donghai gui xingmin Aeroengine Simulation Research Center School of Energy and Power EngineeringBeihang UniversityBeijing100191China Jiangxi Research Institute of Beihang University Nanchang330096China

In the traditional design of the centrifugal compressor,the splitter blade and the main blade always keep the same ***,to enable high efficiency of the high-loading centrifugal compressor,the matching of design parameters of the splitter blade and the main blade needs to be *** this paper,the influence of the load distribution between the main blade and the splitter blade on the aerodynamic performance,the flow field,and the internal vortices of a high-loading centrifugal compressor were studied by means of CFD *** cases with different values of the variable CR which is defined as the load-ratio of splitter blade to main blade were set *** each case,the splitter blade and the main blade were shaped according to different laws of circulation distribution(_(r)V_(u))while the average circulation of the splitter blade and the main blade at any meridional position were consistent with that of the *** results showed that a proper reduction of the load-ratio of splitter blade to main blade is beneficial to suppress the leakage vortex of the splitter blade and reduce the scale of the wake in the channel near the suction-side of the splitter blade,which consequently improves the flow uniformity at the impeller outlet and enhances the aerodynamic performance of both the stage and the *** stage isentropic efficiency of the optimal case was found to be 0.7%higher than that of the prototype and the stage total pressure ratio was also *** optimal value of CR,which in this investigation is 94%,is supposed to be the result of the trade-off between the development of the wake and the leakage vortices in adjacent two *** optimization of the load distribution between the main blade and the splitter blade provides an opportunity to further improve the high-loading centrifugal compressor performance.

关键词： high-loading centrifugal compressor load distribution performance flow uniformity wake leakage vortex

A spanwise loss model for axial compressor stator based on machine learning

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Chinese Journal of Aeronautics 2022年第11期35卷 74-84页

作者： Zixuan YUE Chenghua ZHOU Donghai JIN xingmin gui Aeroengine Simulation Research Center School of Energy and Power EngineeringBeihang UniversityBeijing 100083China Jiangxi Research Institue of Beihang University Nanchang 330096China

In the early stage of aircraft engine design, the through-flow method is an important tool for designers. The accuracy of the through-flow method depends heavily on the accuracy of the loss model. However, most existing models cannot(or cannot well) provide the spanwise loss distribution. To construct an effective spanwise loss model, both turbomachinery knowledge and machine learning skills were used in this paper. A large number of numerical simulations were carried out to build a database containing more than 1000 compressor cascade numerical samples. Secondary flow intensity was introduced as the independent variable to carry out feature engineering. A model containing a selector based on support vector machine regression and estimators based on K-nearest neighbor regression was constructed. Numerical test set and design data of two former highpressure core compressors were used for validation. Results suggest that the spanwise loss model show good consistency with both numerical test set and data of two former compressors. It can reflect the influence of secondary flow and can also predict both value and trend of total pressure loss coefficient well, with mean absolute error general around or less than 1% and R^(2)(coefficient of determination) more than 0.8 on the test set. Especially when dealing with loss coefficient at midspan position, the model shows even better performance, with R^(2)over 0.97 on the test set. And the selector of the model can well classify the samples, predict the intensity of secondary flow and help estimators to capture the phenomenon that end-wall secondary flow extends to the mid-span.

关键词： Compressor Loss model Machine learning Modeling Through-flow method

Numerical and experimental investigation of quantitative relationship between secondary flow intensity and inviscid blade force in axial compressors

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Chinese Journal of Aeronautics 2023年第10期36卷 101-111页

作者： Chenghua ZHOU Zixuan YUE Hanwen GUO Xiwu LIU Donghai JIN xingmin gui School of Energy and Power Engineering Beihang UniversityBeijing 100191China AECC Hunan Aviation Powerplant Research Institute Zhuzhou 412002China Jiangxi Research Institute of Beihang University Nanchang 330096China

The secondary flow attracts wide concerns in the aeroengine compressors since it has become one of the major loss sources in modern high-performance *** the research about the quantitative relationship between secondary flow and inviscid blade force needs to be more *** this paper,a database of 889 three-dimensional linear cascades was *** indicator,called Secondary Flow Intensity(SFI),was used to express the loss caused by secondary *** quantitative relationship between the SFI and inviscid blade force deterioration was *** oil flow and Computation Fluid Dynamics(CFD)results of some cascades were also used to *** suggested that all numerical cascade cases can be divided into 3 clusters by the SFI,which are called Clusters A,B and C in the order of the increasing SFI *** corner stall,known as the strong corner separation,only happens when the SFI is *** calculations and oil flow experiments show that the SFI would stay at a low level if the vortex core at the endwall surface does not *** strong interaction of Kutta condition and endwall cross-flow is considered the dominant mechanism of higher secondary flow losses,rather than the secondary flow penetration depth on the suction *** conclusion,the inviscid blade force spanwise deterioration is strongly related to the *** correlation of the SFI and spanwise inviscid blade force deterioration is given in this *** correlation could provide a quantitative reference for estimating secondary flow losses in the design.

关键词： Axial compressor cascade Corner separation Spanwise inviscid blade force Secondary flow intensity Quantitative correlation

Static pressure redistribution mechanism of non-axisymmetric endwall based on radial equilibrium

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Propulsion and Power Research 2023年第4期12卷 505-522页

作者： Hanwen Guo Donghai Jin Xiwu Liu xingmin gui School of Energy and Power Engineering Beihang UniversityBeijing 100083China Jiangxi Research Institute of Beihang University Nanchang 330096China AECC Hunan Aviation Powerplant Research Institute Zhuzhou 412000China

Non-axisymmetric endwall contouring has been proved to be an effective flow control technique in *** different flow control mechanisms and qualitative design strategies have been *** endwall contouring mechanism based on the flow governing equations is significant for exploring the quantitative design strategies of the nonaxisymmetric endwall *** this paper,the static pressure redistribution mechanism of endwall contouring was explained based on the radial equilibrium equation.A quantified expression of the static pressure redistribution mechanism was *** cascades were simulated using an experimentally validated numerical method to validate the static pressure redistribution mechanism.A geometric parameter named meridional curvature(Cme)is defined to quantify the concave and convex features of the *** indicate that the contoured endwall changes the streamline curvature,inducing a centrifugal ***,the radial pressure gradient is reformed to maintain the radial *** convex endwall represented by positive Cme increases the radial pressure gradient,decreasing the endwall static pressure,while the concave endwall represented by negative Cme increases the endwall static *** Cme helps to establish the quantified relation between the change in the endwall radial pressure gradient and the endwall ***,there is a great correlation between the distributions of the Cme and the change in the endwall static *** can be concluded that the parameter Cme can be considered as a significant parameter to parameterize the endwall surface and to explore the quantitative design strategies of the nonaxisymmetric endwall contouring.

关键词： Turbomachinery Flow control Non-axisymmetric endwall Static pressure redistribution Radial equilibrium equation

Corner Flow Control in High Through-Flow Axial Commercial Fan/Booster Using Blade 3-D Optimization

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Journal of Thermal Science 2012年第1期21卷 32-41页

作者： Fang Zhu Donghai Jin xingmin gui Aeroengine Numerical Simulation Research Center Beihang University Beijing China

This study is aimed at using blade 3-D optimization to control corner flows in the high through-flow fan/booster of a high bypass ratio commercial turbofan engine. Two kinds of blade 3-D optimization, end-bending and bow, are focused on. On account of the respective operation mode and environment, the approach to 3-D aerodynamic modeling of rotor blades is different from stator vanes. Based on the understanding of the mechanism of the corner flow and the consideration of intensity problem for rotors, this paper uses a variety of blade 3-D optimization approaches, such as loading distribution optimization, perturbation of departure angles and stacking-axis manipulation, which are suitable for rotors and stators respectively. The obtained 3-D blades and vanes can improve the corner flow features by end-bending and bow effects. The results of this study show that flows in corners of the fan/booster, such as the fan hub region, the tip and hub of the vanes of the booster, are very complex and dominated by 3-D effects. The secondary flows there are found to have a strong detrimental effect on the compressor performance. The effects of both end-bending and bow can improve the flow separation in corners, but the specific ways they work and application scope are somewhat different. Redesigning the blades via blade 3-D optimization to control the corner flow has effectively reduced the loss generation and improved the stall margin by a large amount.

关键词：优化控制流量控制角落刀片风扇 3维轴向通流

Investigation and Verification of the Aerodynamic Performance of a Fan/Booster with Through-flow Method

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Journal of Thermal Science 2018年第2期27卷 103-110页

作者： LIU Xiaoheng JIN Donghai gui xingmin School of Energy and Power Engineering Beihang University Collaborative Innovation Center of Advanced Aero-Engine Beihang University

Through-flow method is still widely applied in the revolution of the design of a turbomachinery, which can provide not merely the performance characteristic but also the flow field. In this study,a program based on the through-flow method was proposed, which had been verified by many other numerical examples. So as to improve the accuracy of the calculation, abundant loss and deviation models dependent on the real geometry of engine were put into use,such as: viscous losses,overflow in gaps, leakage from a flow path through seals. By means of this program, the aerodynamic performance of a certain high through-flow commercial fan/booster was investigated. On account of the radial distributions of the relevant parameters, flow deterioration in this machine was speculated. To confirm this surmise, 3-D numerical simulation was carried out with the help of the NUMECA software. Through detailed analysis, the speculation above was demonstrated, which provide sufficient evidence for the conclusion that the through-flow method is an essential and effective method for the performance prediction of the fan/booster.

关键词：流动路径空气动力学软件性能数字模拟几何学精确性 3-D

Investigation of Non-Axisymmetric Endwall Contouring in a Compressor Cascade

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Journal of Thermal Science 2017年第6期26卷 490-503页

作者： LIU Xiwu JIN Donghai gui xingmin School of Energy and Power Engineering Beihang University Beijing 100191 China Co-innovation Center for Advanced Aero-engine Beijing 100191 China

The current paper presents experimental and computational results to assess the effectiveness of non-axisymmetric endwall contouring in a compressor linear cascade. The endwall was designed by an endwall design optimization platform at 0° incidence(design condition). The optimization method is based on a genetic algorithm. The design objective was to minimize the total pressure losses. The experiments were carried out in a compressor cascade at a low-speed test facility with a Mach number of 0.15. Four nominal inlet flow angles were chosen to test the performance of non-axisymmetric Contoured Endwall(CEW). A five-hole pressure probe with a head diameter of 2 mm was used to traverse the downstream flow fields of the flat-endwall(FEW) and CEW *** the measured and predicted results indicated that the implementation of CEW results in smaller corner stall,and reduction of total pressure losses. The CEW gets 15.6% total pressure loss coefficient reduction at design condition, and 22.6% at off-design condition(+7° incidence). And the mechanism of the improvement of CEW based on both measured and calculated results is that the adverse pressure gradient(APG) has been reduced through the groove configuration near the leading edge(LE) of the suction surface(SS).

关键词：非轴对称端壁压气机叶栅轮廓总压损失系数设计优化计算结果压力损失同时测量

Modeling and Numerical Investigation of the Inlet Circumferential Fluctuationsof Swept and Bowed Blades

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Journal of Thermal Science 2017年第1期26卷 1-10页

作者： TANG Mingzhi JIN Donghai gui xingmin Aeroengine Numerical Simulation Research Center Beihang University Beijing China.

The circumferential fluctuation(CF) source terms induced by the inviscid blade force can affect the inlet distribution of flow parameters and radial equilibrium of swept and bowed blades. However, these phenomena cannot be adequately described by throughflow methods based on the axisymmetric assumption. A transport model for the CF stresses is proposed and correlated to the distribution of circulation to reflect the effect of the inviscid blade force. To investigate the effect of the inlet CFs on swept and bowed blades, the model is integrated into a throughflow model and applied to a series of cascades with different sweep and bow angles. For swept cascades, the CF source terms change the distributions of incidence angles, as well as the radial equilibrium at the inlet of the blade passage. And the influence is enhanced as the absolute value of the sweep angle increases. For bowed cascades, the distributions of incidence angles are also altered. For both cases, the model can offer a good prediction of the inlet CF source terms, and prove to exert a better prediction of blade design key parameters such as flow angles.

关键词： Throughflow model Circumferential fluctuation (CF) stresses Transport model Swept and bowedblades

Influence of Non-Axisymmetric Terms on Circumferentially Averaged Method in Fan/Compressor

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Journal of Thermal Science 2013年第1期22卷 13-22页

作者： Ke Wan Hailiang Jin Donghai Jin xingmin gui Aeroengine Numerical Simulation Research Center Beijing University of Aeronautics and Astronautics China Aviation Powerplant Research Institute

The governing equations are derived by circumferentially averaging the three-dimensional(3D) Navier-Stokes equations,which are solved using a time marching finite volume *** Euler throughflow model and Navier-Stokes(N-S) throughflow model are employed to investigate the performance and flow fields of a highly loaded transonic single-stage fan ATS-2 and a four-stage *** results are compared with the experimental and three-dimensional computational *** shows that the throughflow models can provide reasonable performance characteristics and N-S throughflow model gives better predictions in endwall regions.A throughflow computation n in which all the non-axisymmetric terms are included has been performed at off-design condition and the radial distributions of the flow field can be well described.

关键词：风扇压气机 Navier-Stokes方程组非轴对称平均法圆周计算结果有限体积法非设计条件