Flow and Heat Transfer of Hydrocarbon Fuel in a Channel with Staggered-Side-Gap Micro Ribs  

作　　者：JIANG Yuguang QI Yongjian WANG Leqing LIN Yong FAN Wei 

机构地区：[1]School of Power and Energy,Northwestern Polytechnical University,Xi’an,710072,China

出　　处：《Journal of Thermal Science》2025年第2期524-541,共18页热科学学报(英文版)

基　　金：sponsored by the National Natural Science Foundation of China(No.51906207,No.U22B2091);the Young Elite Scientists Sponsorship Program by CAST(2021QNRC001);Technical Field Foundation(2021-JCJQ-JJ-0342)。

摘　　要：SCRamjet is exposed to severe thermal environments during hypersonic flights,which poses a serious challenge to the engine cooling technology.Regenerative cooling with hydrocarbon fuel is considered promising,in which the hydrocarbon fuel flows through micro channels(200μm-3 mm)to absorb the combustion heat release.With strictly limited hydrocarbon fuel onboard,heat transfer deterioration and over-temperature are highly possible.In this paper,micro ribs with staggered side gaps are introduced and numerically studied to enhance the heat transfer.Compared with the straight channel and channel with straight micro ribs,the staggered side gaps alleviate the local low velocity zone and intensify the longitudinal and transverse vortexes.The heat transfer is obviously enhanced.Larger rib height enhances the heat transfer by stronger side gap effects at the cost of larger pressure loss.The best overall heat transfer factorηis achieved in the case of h_(rib)/H=0.1,which increases by 204.5%comparing to the straight channel.When the rib interval is too small or too large,it approaches to the straight channel.The best overall heat transfer factorηis achieved in the case of L/p_(rib)=100,which increases by212.9%comparing to the straight channel.It is known the improvement in the geometry of the ribs,i.e.,the staggered-side-gap micro ribs,induces extra transverse vortex and improves the heat transfer performance more effectively.The research of this paper provides support for the cooling design of the SCRamjet.

关 键 词：micro rib staggered side gap heat transfer enhancement hydrocarbon fuel regenerative cooling 

分 类 号：P61[天文地球—矿床学]