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Propulsion and Power Research 2023年第2期12卷 180-198页

作者： P.Novotný P.Kudlácek J.Vacula Brno University of Technology BrnoTechnicka 2896/261669Czech Republic

Gas flow in the seal system can be expected during the operation of a turbocharger and is associated with negative effects on the quality of the lubricant or turbocharger efficiency.Gas flow also affects particulate matter production due to lubricant entrainment in the compressor or turbine.The prediction of gas flow rates depends on many design parameters and the operating conditions of the turbocharger,but sufficiently accurate descriptions of the gas flow mechanisms and their quantification depending on the operating conditions have not yet been presented.The proposed computational approach simultaneously solves the gas dynamics in the seal system,the heat transfer in the turbocharger rotor-bearing system and the dynamics of the seal rings and rotor,including the bearings.The computational model for the turbocharger of a heavy-duty vehicle engine is experimentally validated.Two mechanisms have major influences on gas mass flow:the gas flow through the thin gap between the moving ring and groove and the flow through the ring gap.The results show that the importance of these mechanisms depends on several geometrical dimensions of the seal system and the operating conditions of the turbocharger,with a strong connection to the rotor dynamics and thermal load of the impellers.Influences involving rotor movement or rotor thermal conditions are crucial,and their non-inclusion limits the ability to correctly predict gas mass flow.

关键词： Gas blow-by Gas flow Heat transfer Rotor dynamics turbocharger Seal system

Method for Evaluating the Reliability of Compressor Impeller of turbocharger for Vehicle Application in Plateau Area

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Chinese Journal of Mechanical Engineering 2016年第6期29卷 1218-1225页

作者： WANG Zheng WANG Zengquan WANG A-na ZHUANG Li WANG Jinwei Key Laboratory of Diesel Engine Turbocharging Technology China North Engine Research Institute Center of Engine Test and Measurement China North Engine Research Institute

As turbocharging diesel engines for vehicle application are applied in plateau area, the environmental adaptability of engines has drawn more attention. For the environmental adaptability problem of turbocharging diesel engines for vehicle application, the present studies almost focus on the optimization of performance match between turbocharger and engine, and the reliability problem of turbocharger is almost ignored. The reliability problem of compressor impeller of turhocharger for vehicle application when diesel engines operate in plateau area is studied. Firstly, the rule that the rotational speed of turbocharger changes with the altitude height is presented, and the potential failure modes of compressor impeller are analyzed. Then, the failure behavior models of compressor impeller are built, and the reliability models of compressor impeller operating in plateau area are developed. Finally, the rule that the reliability of compressor impeller changes with the altitude height is studied, the measurements for improving the reliability of the compressor impellers of turbocharger operating in plateau area are given. The results indicate that when the operating speed of diesel engine is certain, the rotational speed of turbocharger increases with the increase of altitude height, and the failure risk of compressor impeller with the failure modes of hub fatigue and blade resonance increases. The reliability of compressor impeller decreases with the increase of altitude height, and it also decreases as the increase of number of the mission profile cycle of engine. The method proposed can not only be used to evaluating the reliability of compressor impeller when diesel engines operate in plateau area but also be applied to direct the structural optimization of compressor impeller.

关键词： turbocharger plateau area compressor impeller failure behavior reliability

turbocharger Noise Prediction Using Broadband Noise Source Model

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Journal of Beijing Institute of Technology 2010年第3期19卷 312-317页

作者：李惠彬孙振莲彭信 School of Mechanical Engineering Beijing Institute of Technology

The noise prediction of the turbocharger is studied.The broadband noise source model is employed to predict the near-field noise of the turbocharger.The 3D software Solidworks is adopted to establish the model blades and inlet of turbocharger compressor,then this 3D model is introduced into the software CFD to calculate the flow-field under different inlet shapes,different blades shapes and different clearances between casing and impeller.On the base of the above simulation,the broadband noise source model is employed to calculate and analyze the near-field noise.The calculation shows that compressor static pressure values and the sound power values near the impeller outlet are the largest.Through the noise calculation by using broadband noise source model under different inlet shapes and blade shapes,we find that the noise level of the inlet of cylindrical and cone types are smaller.Compared with the current widespread used backward skewed or radial blades,there is little difference of the noise value of the inlet of the forward skewed blades.

关键词： turbocharger aerodynamic broadband noise source model

Time-dependent Vibration Frequency Reliability Analysis of Blade Vibration of Compressor Wheel of turbocharger for Vehicle Application

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Chinese Journal of Mechanical Engineering 2014年第1期27卷 205-210页

作者： WANG Zheng WANG Zengquan ZHUANG Li WANG A-na Science and Technology on Diesel Engine Turbocharging Laboratory China North Engine Research Institute Center of Engine Test and Measurement China North Engine Research Institute

Blade vibration failure is one of the main failure modes of compressor wheel of turbocharger for vehicle application. The existing models for evaluating the reliability of blade vibration of compressor wheel are static, and can not reflect the relationship between the reliability of compressor wheel with blade vibration failure mode and the life parameter. For the blade vibration failure mode of compressor wheel of turbocharger, the reliability evaluation method is studied. Taking a compressor wheel of turbocharger for vehicle application as an example, the blade vibration characteristics and how they change with the operating parameters of turbocharger are analyzed. The failure criterion for blade vibration mode of compressor wheel is built with the Campbell diagram, and taking the effect of the dispersity of blade natural vibration frequency and randomness of turbocharger operating speed into account, time-dependent reliability models of compressor wheel with blade vibration failure mode are derived, which embody the parameters of blade natural vibration frequency, turbocharger operating speed, the blade number of compressor wheel, life index and minimum number of resonance, etc. Finally, the rule governing the reliability and failure rate of compressor wheel and the method for determining the reliable life of compressor with blade vibration is presented. A method is proposed to evaluate the reliability of compressor wheel with blade vibration failure mode time-dependently.

关键词： turbocharger compressor wheel blade vibration reliability failure rate reliable life

Effects of Semi-floating Ring Bearing Outer Clearance on the Subsynchronous Oscillation of turbocharger Rotor

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Chinese Journal of Mechanical Engineering 2016年第5期29卷 901-910页

作者： LIANG Feng ZHOU Ming XU Quanyong School of Aerospace Engineering Tsinghua University

Semi-floating ring bearing（SFRB） is developed to control the vibration of turbocharger rotor. The outer clearance of SFRB affects the magnitude and frequency of nonlinear whirl motion, which is significant for the design of turbocharger. In order to explore the effects of outer clearance, a transient finite element analysis program for rotor and oil film bearing is built and validated by a published experimental case. The nonlinear dynamic behaviors ofrotor-SFRB system are simulated. According to the simulation results, two representative subsynchronous oscillations excited by the two hearings respectively are discovered. As the outer clearance of SFRB increases from 24 ~tm to 60 pro, the low-frequency subsynchronous oscillation experiences three steps, including a strong start, a gradual recession and a combination with the other one. At the same time, the high-frequency subsynchronous oscillation starts to appear gradually, then strengthens, and finally combines. If gravity and unbalance are neglected, the combination will start starts from high rotor speed and extents to low rotor speed, just like a ＂zipper＂. It is found from the quantitative analysis that when the outer clearance increases, the vibration amplitude experiences large value firstly, then reduction, and suddenly increasing after combination. A useful design principle of SFRB outer clearance for minimum vibration amplitude is proposed： the outer clearance value should be chosen to keep the frequency of two subsynchronous oscillations clearly separated and their amplitudes close.

关键词： subsynchronous oscillation outer clearance Semi-floating ring bearing rotordynamics turbocharger

Influence of Structural Parameters of turbocharger Floating Bearing on Its Dynamic Characteristic Coefficients

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Journal of Beijing Institute of Technology 2017年第2期26卷 183-190页

作者： Junsheng Zhao Yuantong Gu Shengxian Yi Xuelong Lu School of Mechanical and Power Engineering North University of China School of Chemistry Physics and Mechanical EngineeringQueensland University of Technology

The structure parameters in an actual industrial production have a great influence on the coefficient of supercharger floating bearing dynamic characteristics,but there has been little systematic study so far.In this paper,the influence of structural parameters of the turbocharger floating bearing on its dynamic characteristic coefficientsis systematically investigated based on the theories of hydrodynamic lubrication and tribology.The influence of clearance ratio on eccentricity and the influence of internal to external radius ratios,and Sommerfeld number were analyzed.A new formula of responding characteristics of the oil film force caused by the displacement or velocity disturbance was deduced near an equilibrium in the steady state.Applying the newly developed formula,the dynamic characteristic was studied for floating bearings.Regularity for change of oil film stiffness and damping was analyzed with the structural parameters of floating bearing such as radius ratios and eccentricity.It has been found that the clearance ratio increases with eccentricity when the radius ratio is unchanged.The eccentricity decreases with the internal to external radius ratio of floating rings when the clearance ratio is constant.The absolute value of total principal stiffness and total main damping decrease with the clearance ratio and radius ratio of floating rings when the total cross damping is stable.The results and findings in this paper can contribute to nonlinear dynamics designs of turbocharger rotor-bearing systems.

关键词： turbocharger floating bearing structure parameters dynamic characteristic coefficient

Rotor dynamic analysis of small vehicle gasoline turbocharger in semi-floating bearings

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Journal of Beijing Institute of Technology 2011年第4期20卷 502-508页

作者：张虹张希贺娜娜 School of Mechanical Engineering Beijing Institute of Technology

The critical speed and unbalance response of a small vehicle gasoline turbocharger in semi-floating bearing are analyzed.The dynamical characters of semi-floating bush bearing used in small vehicle gasoline turbocharger were summarized by comparing the structure and shaft rigid mode of semi-floating bush bearings with those of floating bush bearings.The rotor model was built.The first,second and third mode of critical speeds of rotor system were computed,and the changes in the compressor or turbine bushing bearing clearances were analyzed.Compared with the experiment data,the accuracy and the rationality of computation model were verified.The unbalance response and time transient rotor response were also computed.

关键词： rotor turbocharger semi-floating bearing

Enhancement of turbocharger Compressor Performance by Designing a New Housing Structure

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Enhancement of Turbocharger Compressor Performance by Design...

Matching & Testing of turbocharger Based on FSC Racing Engine

2021中国汽车工程学会年会暨展览会

作者： Bai Cuiping Zhou Tianjun Ye Xiao Ma Qihua Shanghai University of Engineering Science

In this study,there are two turbocharger compressor housing structures to improve the turbocharger compressor pressure ratio and efficiency.A certain type of recirculating casing treatment（RCT） can improve the compressor performance near the surge line.And a Hybrid RCT adopting both RCT in the inlet duct and a passage from a volute section to the RCT side can improve the compressor performance at a certain engine operating range.There are 8 different hole position models for Hybrid RCT compressor.Using the CFX software,we obtained the simulation results of all compressor models.At 140000 r/min,the different connecting hole position of Hybrid-RCT has different performance for pressure ratio and efficiency.Among 8 Hybrid-RCT models,the Hybrid 270 D model shows the best performance from 0.077 kg/s to 0.10 kg/s operating range.

关键词： turbocharger compressor hybrid RCT pressure ratio efficiency surge

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Matching & Testing of Turbocharger Based on FSC Racing Engin...

Theoretical Analysis and Engineering Design of Spiral Groove Hydrodynamics Thrust Bearing for turbocharger Application

2020中国汽车工程学会年会暨展览会

作者： Su Wei Pan Jialun Wang Zhengming Wuhan University of Technology School of International Education Wuhan university of technology WUT racing Team

The study is related to the calculation and analysis of turbocharger matching for FSAE racing engines.In this paper,firstly,the matching requirements and methods between turbocharger and engine are studied;and according to FSC competition rules,a target engine model is established in the engine performance simulation software GT-Power,and the model is verified by simulation calculation in the software;secondly,after calculation,a suitable turbocharger is selected and installed in the engine performance simulation software GT-Power.The model of Turbocharged engine,intercooler and other components is built in GT-Power.Finally,the dynamic performance of the engine matching the turbocharger is predicted by simulation analysis of the turbocharged engine model and bench test,and the simulation results are analyzed.

关键词： FSAE racing turbocharger GT-Power

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Theoretical Analysis and Engineering Design of Spiral Groove...