The influence of inlet swirl intensity and hot-streak on aerodynamics and thermal characteristics of a high pressure turbine vane  

作　　者：Zakaria MANSOURI Riyadh BELAMADI 

机构地区：[1]ABYLSEN Science&Technology Rhone Alpes,Grenoble 38000,France [2]Ecole Superieure de Technologies Industrielles(ESTI),Annaba 23000,Algeria

出　　处：《Chinese Journal of Aeronautics》2021年第11期66-78,共13页中国航空学报（英文版）

摘　　要：In modern gas turbines,the High Pressure Turbine(HPT)is exposed to an extreme thermal environment due to the burned gases leaving the combustor.The burned gases are characterized by flow and temperature distortions that effect the aerodynamics and heat transfer of the turbine.The purpose of this paper is to investigate numerically the effect of the intensity of the swirling flow combined with the temperature non-uniformity‘‘Hot-Streak"(H-S)on the aerothermal performances of a HPT Nozzle Guide Vane(NGV).The investigations are conducted on the solid untwisted NGV annular cascade developed in NASA Lewis Research Center.Four swirl intensities(|S_(n)|=0,0.1,0.25 and 0.5),two swirl orientations(positive and negative)and two hot-streaks(rounded and radial)at the NGV inlet are considered.The simulations are done by solving the Reynolds Averaged Navier-Stokes(RANS)equations using ANSYS-CFX software.The results show that the H-S with swirl undergoes twisting following the orientation of the swirl.The H-S twist is aggressive under positive swirl compared to the negative swirl case.The inlet swirl generates a new secondary flow structure,so called Swirl Vortex(SV),which induces more aerodynamic losses.The aerodynamic efficiency under negative swirl found to be higher than that under positive swirl.The maximum temperature on the vane surface is controlled by the radial transport of the SV towards the endwalls.

关 键 词：AERODYNAMICS Heat transfer Hot-Streak HP turbine NGV Swirl intensity 

分 类 号：V231[航空宇航科学与技术—航空宇航推进理论与工程]