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film cooling performance and flow structure of single-hole and double-holes with swirling jet

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Chinese Journal of Aeronautics 2022年第3期35卷 201-213页

作者： Rui ZHU Simon TERRENCE Shulei LI Gongnan XIE School of Mechanical Engineering Northwestern Polytechnical UniversityXi’an 710072China Research&Development Institute of Northwestern Polytechnical University in Shenzhen Shenzhen 518057China Department of Mechanical Engineering University of MinnesotaMinneapolisMN 55455USA School of Marine Science and Technology Northwestern Polytechnical UniversityXi’an 710072China

This paper presents the results of a numerical study of the effects of swirling flow in coolant jets on film cooling *** combined-hole designs with swirling coolant flow entering the delivery hole are proposed and *** film cooling effectiveness values for cases with various blowing ratios are *** flow structures and underlying mechanisms are *** results show that film cooling effectiveness is improved with jet swirl at high blowing ratios,and that swirl strength has significant influence on film cooling ***-hole designs can further improve film cooling performance using swirling jets due to mixing of coolant flows and interaction of *** largest improvements of area-averaged film cooling effectiveness for a single-hole swirl case and a combined-hole swirl case over corresponding non-swirling case results are 157%and 173%,respectively.

关键词： Combined-hole film cooling Interactions of vortices Jet-in-cross-flow Swirling flow

film cooling Effectiveness Superposition Calculation of Double-Row Injection Holes on Turbine Vane

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Journal of Thermal Science 2022年第6期31卷 2424-2437页

作者： XU Zhipeng ZHU Huiren LIU Cunliang YE Lin ZHOU Daoen School of Power and Energy Northwestern Polytechnical UniversityXi'an 710072China Shaanxi Key Laboratory of Thermal Sciences in Aero-engine System Xi'an 710129China

film cooling effectiveness superposition of double-row injection holes on the turbine vane was studied by infrared temperature measurement experiment. The Sellers superposition method and a modified Sellers method were adopted for dustpan-shaped hole and cylindrical hole. Numerical simulations were implemented to analyze the film superposition mechanism. It is found that the Sellers method is more accurate on the suction side than the pressure side. Injection film of the two types of holes exhibits different superposition modes. Cylindrical hole are “blocky-like” superposition. Dustpan-shaped hole are “sheet-like” superposition. The counter-rotating vortex pairs and separation of the film are the main factors affecting the accuracy of Sellers film superposition method. The modified method can significantly improve the superposition prediction accuracy for almost all situations. The modified method reduces superposition errors from 28% to 3% for the cylindrical hole, and from 42% to 13% for the dustpan-shaped hole on the suction side. It reduces superposition errors from 30% to 8% for the cylindrical hole, and from 23% to 15% for the dustpan-shaped hole on the pressure side.

关键词： film cooling superposition calculation shaped hole infrared temperature measurement numerical simulation

Unsteady Numerical Simulation of Hot Streak/Blades Interaction and film cooling

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Journal of Thermal Science 2010年第5期19卷 402-409页

作者： Weilin Yi,Lucheng Ji and Yunhan Xiao Research Center for Energy and Power,Chinese Academy of Sciences,Beijing,China Key Laboratory of Advanced Energy and Power,Chinese Academy of Sciences,(Institute of Engineering Thermophysics),Beijing,China P.O.Box 2706,Beijing 100190,China Research Center for Energy and Power Chinese Academy of Sciences Beijing China Key Laboratory of Advanced Energy and Power Chinese Academy of Sciences (Institute of Engineering Thermophysics) Beijing China Beijing China

Deeply research on management and application of hot streak is an important way to breakthrough technique obstacle of aero engine hot *** method is a useful instrument to investigate the correlative *** the paper developed independently three dimensional unsteady parallel computational code-MpiTurbo based on Fortran 90 and MPI at Linux operating *** unsteady numerical simulation was carried out to investigate impacts of the factors,which included circumferential locations of hot streak and clocking positions of blade rows,on the thermal environment of a 1+1 counter-rotating *** results clearly indicated that clocking positions of hot streak/blade row and blade row/blade row had great influence on the time-averaged temperature distribution of the third blade ***,it can be effective for improving thermal environment of turbine to optimize blade parameters and clocking *** film cooling layout was designed by the repetitious steady simulation based on source term *** the flow structure detail was given by the unsteady simulation.

关键词： hot streak turbine parallel computation film cooling

Experimental Study on the film cooling Characteristics of Three Complex Tip Structures

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Journal of Thermal Science 2023年第4期32卷 1378-1392页

作者： LIN Juqiang LI Haiwang YOU Ruquan LIU Runzhou TAO Zhi LIU Song School of Energy and Power Engineering Beihang UniversityBeijing100191China Research Institute for Aero-Engines Beihang UniversityBeijing100191China National Key Laboratory of Science and Technology on Aero Engines Aero-thermodynamics Beijing100191China AECC Sichuan Gas Turbine Establishment Sichuan610500China

The turbine blades of aircrafts must be properly cooled to prevent engine ***,to investigate the influence of the tip structure on the film cooling effect,pressure-sensitive paint test technology was used to determine the adiabatic film cooling effectiveness in this *** experiment was completed in a cascade comprising three straight *** effects of the blowing ratio,density ratio,tip clearance,and tip structure on film cooling efficiency were *** experimental results demonstrated that,as the blowing ratio increased,the film coverage area and film cooling efficiency increased under most experimental ***,the film cooling efficiency was found to initially increase,and subsequently decrease,as the blowing ratio *** respective influences of the density ratio and tip clearance on the film cooling efficiency were found to be *** density ratio experiments revealed that a high-density ratio can result in better film coverage than the low-density-ratio *** tip clearance experimental results indicated that a small tip clearance promotes an increase in film cooling efficiency;this is because the small tip clearance negatively affects the main stream leakage flow,which can reduce the film coverage *** the conditions of the Base case 2 configuration,a blowing ratio of 2.1,and a tip clearance of 0.6%h,the average film cooling efficiency of the blade tip was *** the three blade tip structures applied in this study,Base case 2 demonstrated higher film cooling efficiency than the other two blade tip structures under the conditions of the same blowing ratio,tip clearance,and density ratio.

关键词： film cooling tip structure pressure-sensitive paint leakage flow

Novel Shaped Sweeping Jet for Improved film cooling and Anti-Deposition Performance

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Journal of Thermal Science 2024年第6期33卷 2089-2096页

作者： ZHOU Wenwu WANG Kechen ZHANG Tianluan WEN Xin PENG Di LIU Yingzheng Key Lab of Education Ministry for Power Machinery and Engineering School of Mechanical EngineeringShanghai Jiao Tong UniversityShanghai 200240China Gas Turbine Research Institute Shanghai Jiao Tong UniversityShanghai 200240China

The present study proposed a shaped sweeping jet(SJ)that possesses the merits of both SJ and shaped hole,which demonstrates significantly improved cooling effectiveness and anti-deposition *** to a classical 777 shaped hole,the shaped SJ exhibits a maximum enhancement of 70%in cooling effectiveness and a maximum reduction of 28%in particle deposition height,*** to the periodic oscillation of coolant jet and higher streamwise jet momentum,the shaped SJ can provide much wider coolant coverage and therefore sweep the adhesive particle away from the *** study is the first attempt to reconcile the performance of film cooling and particle anti-deposition simultaneously,which offers a promising design concept for future engine cooling.

关键词： sweeping jet film cooling particle deposition pressure sensitive paint multi-perspective scanni

Numerical Investigations of film cooling Characteristics of Interrupted Slot and Trench Holes on a Vane Endwall

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Journal of Thermal Science 2021年第3期30卷 1010-1024页

作者： XIAO Xiangtao WANG Pei DU Qiang XU Qingzong LIU Jun ZHU Junqiang Key Lab of Light-duty Gas-turbine Institute of Engineering ThermophysicsChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China Innovation Academy for Light-duty Gas Turbine Chinese Academy of SciencesBeijing 100190China

This paper describes film cooling characteristics of the novel combined configuration employing interrupted slot and trench holes on a vane *** slot,formed by uneven thermal expansion between combustor and high-pressure turbine vane,can improve adiabatic film cooling effectiveness of the leading edge and pressure side-endwall junction by inhibiting the development of horseshoes *** embedded into a straight trench were introduced to improve film efficiency comparing to cylindrical holes on vane passage *** influences of lateral pressure gradient,slot coolant and step on crossflow of the hole coolant in trench were mainly *** dimensional Reynolds-averaged Navier-Stokes equations with shear stress turbulence model(SST k-ω)were used to obtain the flowfields and adiabatic film cooling effectiveness of a cascade *** hole blowing ratios M=0.5,1.0,1.5,2.0 and two axial positions X/Cax=–0.05,0 were *** coolant crossflow in trench on flat endwall of cascade passage trends to flow towards suction side due to the lateral pressure gradient rather than both sides on flat *** combined configuration of interrupted slot and trench holes,the step vortex rolls up hole coolant upstream of trench which changesηdistributions comparing to that on flat passage *** to the cylindrical holes,better film cooling performance can still be obtained when arranging trench holes under high blowing *** influence of hole’s axial positions was also discussed.

关键词： film cooling trench holes blowing ratio lateral pressure gradient step vortex axial position

Conjugate Heat Transfer Analysis of film cooling Flows

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Journal of Thermal Science 2006年第1期15卷 85-91页

作者： Xiaochen LU Peixue JIANG Hideaki SUGISHITA Hideyuki UECHI Kiyoshi SUENAGA Department of Thermal Engineering Tsinghua University Beijing 100084 China Takasago Research and Development Center Mitsubishi Heavy Industries Ltd. Takasago 676-8686 Japan

The objective of this study is to evaluate the potential of various grids to satisfactorily simulate the development of a cooling film, using a coupled computation that takes into account the full geometry. Detailed computations of a single row of 30 degrees round holes on a flat plate are presented for blowing ratios of 0.764, 1.01 and 1.54. The simulation results are compared well with experimental data. The two-layer model gave more accurate results but consumed much more computational time than the standard wall functions. The k-ε turbulence model with wall functions with appropriate values of y^＋ is suitable for practical use. The results show the importance of the conjugate calculation for accurately describing the influence of the heat transfer within the cooling film.

关键词： film cooling conjugate heat transfer blowing ratio.

Experimental Investigation on film cooling Performance of Pressure Side in Annular Cascades

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Journal of Thermal Science 2011年第2期20卷 119-126页

作者： Li Guoqing Deng Hongwu National Key Lab. of Science and Technology on Aero-Engines Beijing University of Aeronautics and AstronauticsBeijing 100191 China

Experimental investigations were conducted to study the film cooling performance in a low speed annular cascades using Thermochromic Liquid Crystal (TLC) technique. The test blade was placed in the second stage, where 18 blades were installed with chord length of 124.3 mm and height of 99 mm. A film hole with diameter of 4 mm, angled 28° to the tangential of the pressure surface in streamwise, was set in the middle span of the blade. The Reynolds number based on the outlet mainstream velocity and the blade chord length of the second stage varied from 1.52×105 to 2.00×105. All measurements were made with the blowing ratio varying from 0.3 to 3.0. Air and CO2 worked as coolant to achieve the coolant-to-mainstream density ratio of 1.03 and 1.57. The results show that the film coverage and cooling effectiveness scale up with the blowing ratio. Higher density ratio can generate larger film cooling coverage and effectiveness. The higher the Reynolds number, the larger the film coverage and cooling effectiveness.

关键词： film cooling annular cascades blowing ratio density ratio effectiveness

Effects of Chemical Reaction Caused by cooling Stream on film cooling Effectiveness

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Journal of Thermal Science 2012年第1期21卷 60-65页

作者： Keyong Cheng Shiqiang Liang Xiulan Huai Wei Chen Yongxian Guo Institute of Engineering Thermophysics Chinese Academy of Sciences Beijing 100190 China Graduate University of Chinese Academy of Sciences Beijing 100049 China School of Mechano-electronic Engineering Xidian University Xi’an 710071 Shaanxi China

With the increase of inlet temperature of gas turbines, the benefits by using the conventional methods are likely to approach their limits. Therefore, it is essential to study novel film cooling methods for surpassing these current limits. Based on the theory of heat transfer enhancement, a film cooling method with chemical reaction by cool- ing stream is proposed. In order to test the feasibility of the proposed method, numerical simulations have been conducted. The classic flat plate structure with a 30 degree hole is used for the simulation. In the present study, the effects of the parameters in relation to the chemical reaction on film cooling effectiveness, such as chemical heat sink, volume changes, and reaction rate, are investigated numerically. The conventional film cooling is also calculated for the comparison. The results show that film cooling effectiveness is improved obviously due to the chemical reaction, and the reaction heat and reaction rate of cooling stream have an important effect on film ef- fectiveness. However, the effect of volume changes can be ignored.

关键词： Gas turbine film cooling Chemical reaction Heat transfer Numerical simulation