Cavitation inception in fast startup
Cavitation inception in fast startup
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发表时间：
2008
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通讯作者：
Sébastien Duplaa;O. Coutier-Delgosha;A. Dazin;G. Bois;G. Caignaert;O. Roussette
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作者：
Sébastien Duplaa;O. Coutier-Delgosha;A. Dazin;G. Bois;G. Caignaert;O. Roussette
火箭发动机涡轮泵的启动一般只需几秒钟。这意味着这些泵仅在几次旋转后就达到其标称操作条件。在叶片的这些第一次旋转期间，泵中的流量演变由瞬态现象决定，主要基于流量和转速演变。当达到稳定行为时，这些现象逐渐变得可以忽略不计。泵瞬态行为引起显著的压力波动，这可能导致部分流汽化，即气穴。LML实验室（法国里尔）已更新了现有的实验测试装置，用于离心泵的启动。研究的重点是泵启动过程中产生的汽蚀。扭矩、质量流率、入口和出口不稳定压力以及泵旋转速度的瞬时测量能够表征快速启动期间的泵行为。
The start-up of rocket engine turbopumps is generally performed only in a few seconds. It implies that these pumps reach their nominal operating conditions after only a few rotations. During these first rotations of the blades, the flow evolution in the pump is governed by transient phenomena, based mainly on the flow rate and rotation speed evolution. These phenomena progressively become negligible when the steady behaviour is reached. The pump transient behaviour induces significant pressure fluctuations which may result in partial flow vaporization, i.e. cavitation. An existing experimental test rig has been updated in the LML laboratory (Lille, France) for the start-ups of a centrifugal pump. The study focuses on cavitation induced during the pump start-up. Instantaneous measurement of torque, mass flow rate, inlet and outlet unsteady pressures, and pump rotation velocity enable to characterize the pump behaviour during rapid starting periods.