Study of pressure surge during priming phase of start transient in an initially unprimed pump-fed liquid rocket engine

IF 5.4 2区工程技术 Q1 ENGINEERING, AEROSPACE

Propulsion and Power Research Pub Date : 2022-09-01 DOI:10.1016/j.jppr.2022.07.003

Debanjan Das, P. Padmanabhan

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引用次数: 3

Abstract

In this paper, transient phenomenon during start up process of a pump fed liquid rocket engine is investigated through numerical simulation. The engine studied in this work is designed such that engine systems are not wetted with propellant until the engine is commanded to start. This is achieved by positioning the valves for propellant admission at the interface of test stand/flight stage and the engine. To evaluate engine performance during start transient for such systems, unsteady flow simulation was conducted using Method of Characteristics and equations for priming. The same has been reported in this work. The results indicated a brief period of abrupt pressure rise at pump upstream after opening of the propellant admission valves, during the process of priming of engine systems at valve downstream. The peak pressure obtained was significantly higher than the propellant tank pressure as well as the steady state pump suction pressure. The transitory pressure rise was found to occur due to flow resistance at impeller inlet caused by formation of a forced vortex for orienting the flow through impeller blades during off design transient regime. The maximum pressure at pump upstream, as computed from start transient simulation, was used as a design input for pump inlet feed lines. The engine was realized and subsequently qualified in a ground test facility. Hot test data obtained for pressure and flow rate during transient regime were found to be in good agreement with the simulation results.

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初始无起爆泵供液体火箭发动机启动瞬态起爆阶段压力波动研究

本文通过数值模拟研究了泵供液体火箭发动机启动过程中的瞬态现象。在本工作中所研究的发动机是这样设计的:在命令发动机启动之前，发动机系统不会被推进剂浸湿。这是通过在试验台/飞行级和发动机的界面上定位推进剂入口阀门来实现的。为了评估这类系统在启动瞬态时的发动机性能，采用特性法和启动方程进行了非定常流场模拟。在这项工作中也有同样的报道。结果表明，在气门下游启动发动机系统的过程中，在推进剂入口阀打开后，泵上游有短暂的突然压力上升。得到的峰值压力明显高于推进剂罐压力和稳态泵吸入压力。研究发现，在非设计瞬态工况下，叶轮入口处形成的强迫涡引导叶轮叶片的流动，造成了流动阻力，从而导致了压力的短暂上升。通过启动瞬态模拟计算得到的泵上游的最大压力，作为泵入口进给管线的设计输入。该发动机实现并随后在地面测试设施中获得合格。在瞬态工况下获得的压力和流量热试验数据与模拟结果吻合较好。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Propulsion and Power Research Multiple-

CiteScore

7.50

自引率

5.70%

发文量

期刊介绍： Propulsion and Power Research is a peer reviewed scientific journal in English established in 2012. The Journals publishes high quality original research articles and general reviews in fundamental research aspects of aeronautics/astronautics propulsion and power engineering, including, but not limited to, system, fluid mechanics, heat transfer, combustion, vibration and acoustics, solid mechanics and dynamics, control and so on. The journal serves as a platform for academic exchange by experts, scholars and researchers in these fields.