Multiple-working-conditions flowrate control for liquid engine test

After analyzing the difficulty of the multiple-working-condition flowrate control during the liquid engine test and the shortcoming of the single cavitation venturi for the flowrate control,a cavitation venturi combination method is proposed.The characteristic of the cavitation margin of the venturi is considered in the method.The range of the working-conditions covered by the single venturi is pointed out in this paper.Firstly,the minimum throat diameter satisfying the demand of the working-conditions is obtained by computation,and then the working-conditions covered by this venturi are computed.Finally,the working-conditions covered by the combination of the venturi and the previously-obtained Venturis are eliminated until no working-condition remains.The instance shows that less Venturis can realize the flowrate control of the multiple-working-condition engine test and the cavitation margin affects the result.Test proves that the proposed method can solve the problem of the multiple-working-condition flowrate control effectively and economically.