航天推进技术研究院主办
WANG Yanhong,LU Yingnan,LI Haoran,et al.Effect of hyper-gravity on heat transfer of supercritical n-decane flowing in horizontal circular tube[J].Journal of Rocket Propulsion,2021,47(05):78-84.
超重力条件下水平圆管内超临界正癸烷换热研究
- Title:
- Effect of hyper-gravity on heat transfer of supercritical n-decane flowing in horizontal circular tube
- 文章编号:
- 1672-9374(2021)05-0078-07
- 分类号:
- V231.1
- 文献标志码:
- A
- 摘要:
- 为深入理解超重力下飞行器发动机的热管理问题,进行了水平通道中正癸烷的超临界换热数值研究。探究了拟膜态层换热机理,考察了热传导过程、二次流效应及其对管周向非均匀传热恶化的作用机制,提出了周向最大换热差别预测模型。建立了水平管的浮升力准则。研究发现:重力加速度增大致使流体域密度异常分层加剧,周向不平衡动能增加,二次流增强 固体域温度异常分层也加剧,增强了热流密度的周向分配。提高压力使流体密度变化趋缓,可削弱超重力对换热过程的影响。
- Abstract:
- In order to deeply understand the thermal management problem in aircraft engines under hyper-gravity conditions,a numerical investigation on supercritical heat transfer of n-decane in the horizontal channel has been conducted. The heat transfer mechanism of pseudo-film layer was explored. The heat conduction process,secondary flow characteristic and its effect on non-uniform deteriorated heat transfer along the circumferential direction of tube were investigated. A prediction model of circumferential maximum heat transfer difference was proposed. A buoyancy criterion for horizontal tubes was established. The research results indicate that the abnormal density stratification in the fluid domain is enhanced,the circumferential unbalanced kinetic energy is increased,and the secondary flow is strengthened with the increasing gravity acceleration. The abnormal temperature stratification in the solid domain is also aggravated,which enhances the circumferential distribution of heat flux. Increasing the pressure makes the weaker fluid density variation,which can restrain the influence of hyper-gravity on the heat transfer process.
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备注/Memo
基金项目:国家自然科学基金(51576027)
作者简介:王彦红(1983—),男,博士,讲师,研究领域为超临界压力碳氢燃料传热传质。