离心油泵叶轮切割定律及叶片数影响的实验研究

【作者】 叶志明；

【导师】 李文广；

【作者基本信息】 兰州理工大学 ， 流体机械及工程， 2003， 硕士

【摘要】 本文是甘肃工业大学校科研发展基金资助项目《离心油叶轮切割定律的实验研究》的一部分。 在离心油泵生产和使用中，常遇到泵性能参数与设计或用户要求的存在偏差，或暂时不能满足流程的流量和压力要求等问题。所以要求以最少的工作或改变最少的零件几何尺寸，使泵性能参数得到修正，满足要求，达到节能目的。切割泵叶轮是简便、经济的方法。 目前，都采用离心清水泵的切割定律来切割离心油泵叶轮。因为没有考虑粘度对切割定律的影响，所以可能会产生较大误差。到目前为止，国内外还没有对离心油泵的叶轮切割定律进行过研究。 本文以油田和炼油厂常用的，机械工业定型产品65Y60型离心油泵为研究对象，采用试验的方法，全面研究了不同粘度下离心油泵的叶轮切割定律和叶片数对叶轮切割定律的影响规律。通过研究，取得到了以下研究成果： (1)得到了输送水时65Y60型离心油泵叶轮切割定律。 (2)得到了输送粘油时65Y60型离心油泵的叶轮切割规律。 (3)发现在输送水时美国的叶轮切割定律计算结果与本文相差最大为50％。按美国的切割指数用于离心油泵叶轮切割，误差比较大。 (4)切割指数同时随着切割后的直径比和液体粘度变化而变化。 (5)得到了叶片数对离心油泵叶轮切割定律的影响规律性。 (6)随着粘度的增大，不同叶片数的叶轮扬程切割指数发生变化。当粘度小于188cSt时，扬程切割指数趋于2；当粘度大于188cSt后，扬程切割指数趋于2.5。 (7)随着粘度的增大，不同叶片数的叶轮轴功率切割指数趋于定值。当粘度小于188cSt时，各个叶轮的轴功率切割指数趋于定值2.8～3。当粘度大于188cSt后，趋于2.0～2.75。 (8)不同叶片数叶轮的流量切割指数大体上趋于定值，约为1。效率切割指数大约在0～1之间。更多还原

【Abstract】 The work is one part of the project, which is supported by scientific Research & Development fund, Gansu University of Technology.In the application of centrifugal oil pumps, we often meet the problem that is the offset in their performance parameters, or flow rate and pressure in processes can’t satisfy the design and user’s requirement. This requires that the performance parameter of pumps is revised by using the least effort or by modifying the least flow elements geometry, and results into energy saving. Cutting the impeller of pumps is a convenient and economical method for this purpose.Nowadays, the affinity law of impeller trim for the centrifugal water pumps is applied to impeller trim for the centrifugal oil pumps. Because the influence of the viscosity in the law is not considered, the viscosity will lead to large error. Up to now, there is no research on the affinity law of impeller trim for the centrifugal oil pumps.The centrifugal oil pump of type 65Y60, finalized by the former Ministry of Machinery-Building of China is used as a model, which is widely utilized in oilfields and refineries. The affinity law of impeller trim for the pumps at various viscosity and the influence of number of blades on the law have been thoroughly investigated by experiments. Based on the findings of the investigation, the following conclusions should be made:[1] The affinity law of impeller trim for the centrifugal oil pump 65Y60 is obtained when handling water from the experiments.[2] The affinity law of impeller trim for the centrifugal oil pump 65Y60 is gained when pumping viscous oil.[3] The greatest error is 50% between the result given by the affinity law of U.S.A and that calculated by using the trim law issued in this work.[4] The trim exponents vary with the fluid viscosity and impeller diameter ratio at same time.[5] The influence of the number of blades on the affinity law of impeller trim for the centrifugal oil pump is obtained.[6] Head exponent of the impeller for the various number of blades changes when viscosity increases. When viscosity is less than 188cSt, head exponent approaches to 2. When viscosity more than this value, the exponent closes to 2.5.[7] Power exponent of the impeller for the different number of blades changes when viscosity increases. When viscosity is less than 188cSt, the exponent closes to 2.8~3. When viscosity more than 188cSt, it closes to 2~2.75.[8] Flow rate exponent of the impeller for the different number of blades approaches to 1. Efficiency exponent approaches to 0~ 1.更多还原