In order to clarify the effect of the guide vane blade number on unsteady flow in axial-flow oil-gas multiphase pump ,based on two-phase flow theory of the Mixture model.the SST model was used for turbulence. Taking self-developed YQH-IOO oil-gas multiphase pump as investigation object, numerical simulations of internal unsteady flow of the oil-gas multiphase pump under the condition of different number of guide vane and gas volume fraction. After the performances are analyzed, results in the studies are as follows. When the guide vane blade number increases .the heads of oil-gas multiphase pump tend to decrease with decrea-sing trend gradually slow ,the maximum relative were less than 7. 9% . When gas volume fraction were 0 , the efficiency of oil-gasmultiphase pump rised first and then decreased . When gas volume fraction were 50% .the efficiency of oil-gas multiphase pump gradually increased.the maximum relative were less than 3. 7% . After the pressure fluctuation of monitoring points are analyzed,the results show when gas volume fraction were 50% , the pressure fluctuation amplitudes of monitoring points is larger. When the guide vane blade number increases,pressure fluctuation of the flow in guide vane was more obvious.the attenuation of pressure fluctuation amplitudes was slow , the pressure fluctuation amplitudes of the blade passing frequency is gradually reduced. In con-clusion .when guide vane blade number is 9 , the unsteady flow characteristic in oil-gas multiphase pump was better by the gas phase distribution of the secondary impeller can also reflect the oil-gas multiphase pump running is more stable.%为了阐明导叶叶片数对轴流式油气混输泵内部非定常流场的影响,基于MixUure模型的两相流理论,湍流模型采用SST模型,以自主研制的YQH-100油气混输泵为研究对象,对油气混输泵不同导叶叶片数及不同含气率时的内部非定常流场迸行了数值计算.结果表明:随着导叶叶片数的增加,油气混输泵的扬程下降趋势逐渐变缓,其最大差值为7.9%;油气混输泵的效率在含气率为0时先升高后降低,在含气率为0.5时逐渐升高,其最大差值为3.7%.对监测点压力脉动的变化分析表明,含气率为0.5时,监测点压力脉动的幅值更大.随着导叶叶片数的增加,导叶流道内压力脉动的变化更明显,压力脉动幅值的衰减变缓,叶频压力脉动的幅值逐渐减小.研究结果为导叶叶片数为9时,油气混输泵内非定常流动特性更好,由二级叶轮气相分布也能反映出混输泵的运行更稳定.
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