目的 研究双喷嘴射流泵在井下水力举升过程中的冲蚀磨损特性，探究影响冲蚀磨损特性的因素及其规律。方法 结合固液两相流的冲蚀模型和计算流体力学(CFD)方法对射流泵泵芯在流场中的冲蚀磨损行为进行模拟，预测易发生冲蚀磨损的区域，并通过实验验证，进一步探究颗粒直径、质量流量、动力液流量等参数对泵芯冲蚀特性的影响规律。结果 射流泵泵芯的易冲蚀区域为喉管入口内壁面、喉管出口内壁面、扩散管入口附近内壁面等3个位置，通过实验验证了仿真模型的准确性。在控制单因素变量条件下，粒径从0.05 mm增大到1.1 mm时，喉管入口锥面冲蚀位置由闭合圆环状变为三角状，扩散管入口处冲蚀区域面积逐渐减小。质量流量从0.005 kg/s增至0.01 kg/s时，易冲蚀区域最大冲蚀率和冲蚀面积随之增大，喉管入口锥面的最大冲蚀率增大了2倍，喉管-扩散管的最大冲蚀率增大了1.93倍。动力液流量从11 L/s增至15 L/s时，易冲蚀区域的最大冲蚀率随之增大，喉管入口锥面的最大冲蚀率增大了14.2倍，喉管-扩散管的最大冲蚀率增大了1.3倍。结论 对最大冲蚀率的数值和增长倍数进行综合分析发现，动力液流量是冲蚀率增长的主要驱动因素，该研究能够为双喷嘴射流泵的设计和应用提供参考。

The work aims to study the erosion and wear characteristics of the flow field of the double nozzle jet pump in the process of hydraulic lifting and drainage and explore the main affecting factors and rules. Based on the basic theory of solid-liquid two-phase flow and erosion model, a simulation model of pump core flow field erosion wear was constructed, and relevant and effective calculations were made on the downhole hydraulic lifting of the double nozzle jet pump for double-layer pipe. Computational fluid dynamics (CFD) method was adopted to simulate the erosion wear behavior of jet pump core flow field, and the areas prone to erosion wear in the use of jet pump core were predicted. The effect of particle diameter, mass flow rate and dynamic fluid flow rate on the erosion characteristics of pump core was investigated. On the inner wall of the throat entrance, the inner wall of the throat outlet and the inner wall near the entrance of the diffusion tube, the erosion of the nozzle, the middle part of the throat and the wall at the end of the diffusion tube was small, and the erosion shape of the cone of the throat entrance was "triangle". The erosion-prone area should be considered and strengthened in the design. Under the condition of controlling single factor variables, when the particle size increased from 0.05 mm to 1.1 mm, the erosion position of the cone surface of the inlet of the pipe changed from a closed circle to a triangular shape, and the erosion area at the entrance of the diffusion tube gradually decreased. The maximum erosion rate of one surface of the inlet of the pipe with a particle size of 0.1 mm was 5.5 times that of that with a particle size of 0.7 mm. The maximum erosion rate of the tube-diffusion tube with a particle size of 0.1 mm was 6.2 times of that with particle size of 1.1 mm. When the mass flow rate increased from 0.005 kg/s to 0.01 kg/s, the maximum erosion rate and the erosion area in the erosion-prone area increased with the increase of the mass flow rate, the maximum erosion rate of the inlet cone of the throat increased by 2 times, and the maximum erosion rate of the throat-diffusion tube increased by 1.93 times. When the power fluid flow rate increased from 11 L/s to 15 L/s, the maximum erosion rate in the erosion-prone area increased with the increase of the power fluid flow rate, the maximum erosion rate of the inlet cone of the throat increased by 14.2 times, and the maximum erosion rate of the gut-diffusion tube increased by 1.3 times. Based on the analysis of the maximum erosion rate and the growth multiple, the dynamic fluid flow rate is the main factor of erosion rate growth, and strict control of the dynamic fluid flow rate can significantly reduce the erosion situation. This study provides theoretical basis and data support for the design of a new type of jet pump with diverter nozzle structure, offers guidance for the design and application of double nozzle jet pump, and has important reference significance for reducing the cost and risk of oil and gas production.