Local resistance characteristics of elbows for supercritical pressure RP-3 flowing in serpentine micro-tubes  

作　　者：Yanchen Fu Yinlong Liu Juan Wang Yu Wang Guoqiang Xu Jie Wen 

机构地区：[1]Research Institute of Aero-engine,Beihang University,Beijing 100191,China [2]National Key Laboratory of Science and Technology on Aero-Engine Aero-thermodynamics,Beihang University,Beijing 100191,China [3]Zhongfa Aviation Institute of Beihang University,Hangzhou 310023,China [4]AECC Sichuan Gas Turbine Research Institute,Chengdu 610500,China [5]AECC Hunan Aviation Powerplant Research Institute,Zhuzhou 412002,China [6]School of Energy and Power Engineering,Beihang University,Beijing 100191,China

出　　处：《Propulsion and Power Research》2024年第2期245-256,共12页推进与动力（英文）

基　　金：Fundamental Research Funds for the Central Universities (No.501XTCX2023146001 and 501QYZX2023146001);the National Major Science and Technology Projects of China (Nos.J2019-III-0021-0065 and J2019-III-0015-0059);the Science Center for Gas Turbine Project (No.P2022-C-II-005-001).

摘　　要：Based on the demands of compact heat exchangers and micro cooling channels applied for aviation thermal protection on aero-engines,the elbow localflow resistance charac-teristics for supercritical pressure aviation fuel RP-3flowing in adiabatic horizontal serpentine tubes with the inner diameter of 1.8 mm and the massflux of 1179 kg/(m^(2)·s)were experimen-tally studied.The long-short-tube method was used to obtain the elbow pressure drop from the total serpentine tube pressure drop,and the effects of system pressures(P/Pc=1.72-2.58)and geometry parameters including bend numbers(n=5-11),bend diameters(D/d=16.7-27.8),and bend distances(L/d=20-60)on elbow pressure drops and local resistance co-efficients are analyzed on the basis of the thermal physical property variation.The results show that both the increase in the elbow pressure drop and the decrease in the local resistance coef-ficient with temperatures speed up at the near pseudo-critical temperature region of T>0.85Tpc.And the growth of the elbow local pressure drop could be inhibited by the increase of system pressures,while the local resistance coefficient is slightly affected by pressures.The influence of bend diameters on the local resistance coefficient is mild when D/d is larger than 22.2 in the premise of fully developedflow in straight tubes.Furthermore,a piecewise empir-ical correlation considering the bend diameter and physical property ratio is developed to pre-dict the elbow pressure drop of the serpentine tube and optimize the layout of the cooling tube system on aero-engines.

关 键 词：Supercritical pressure Aviation fuel Local resistance coefficient ELBOW Serpentine tube Empirical correlation 

分 类 号：O35[理学—流体力学]