Inducer Design That Avoids Rotating Cavitation

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Inducer Design That Avoids Rotating Cavitation

Abstract:

Rotating cavitation instabilities in inducers are often encountered in turbopumps of rocket engines even in the normal running conditions.

They impact on bearings radial loads, on pipe pressure oscillations and then decrease the engine reliability. The inducer presented here was designed with the goal to suppress these instabilities.

The first part of this paper presents the specific method used to design this inducer. The main criteria are a positive pressure gradient through the blade overlapping domain to obtain positive slope of breakdown curve and a high incidence angle to obtain a mono-cell backflow cavitating pattern. The second part presents experimental results from water test rig and show that the main goal is fulfilled. In the last part, a comparison between experimental results and numerical simulations is presented. Both non-cavitating 3D Navier-Stokes and 1D dynamic analysis of the response system contribute to more clearly understand the flow pattern through the inducer.