浸没式喷水推进自航试验及数值模拟

浸没式喷水推进器与船体高度融合,难以通过试验的方法测量推进器各部件受力,因此文中采用船模水池试验和数值模拟相结合的方法来分析浸没式喷水推进的水动力特点。该文首先开展了船模拖曳阻力试验,测量了船模阻力、纵倾角及重心升沉。然后开展船模自航试验,测量了船模纵倾角、升沉及轴的转速、力矩、推力等数据。基于CFX软件,对拖曳阻力试验及船模自航试验进行了数值模拟。在四个不同航速下的数值模拟中,阻力计算误差在3.7%以内,轴推力计算误差在2.7%以内,轴力矩计算误差在4.6%以内,试验测量值和CFD预报值吻合较好。通过数值模拟可以进一步得到浸没式喷水推进器上各部件的受力情况,泵的流量、扬程及其它流场信息,克服了浸没式喷水推进器推力测量和流场测量的困难。

Submerged waterjet self-propulsion test and numerical simulation

Because the submerged waterjet propulsor is fully integrated in the ship, the force on propulsor is hard to measure in towing tank test. In this paper, towing tank test method and numerical simulation method were combined to predict the performance of submerged waterjet. The resistance, trim angle and sinkage of ship model were measured in towed resistance test. And the self-propulsion test was conducted and the rotation speed, torque and thrust of shaft, etc. were measured. The towed resistance test and self-propulsion test were numerically simulated based on CFX software. The predicted resistance error was within 3.7%, the shaft thrust error was within 4.7% and the shaft torque error was within 4.6% at four different speeds. Proved by towing tank test, numerical simulation could get the thrust of submerged waterjet propul-sor, massflow, head and other flow field information in addition, solving the difficulties in measuring thrust and flow field.