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V. M. Ryazantsev 《Chemical and Petroleum Engineering》1989,25(5):250-252
Translated from Khimicheskoe i Neftyanoe Mashinostroenie, No. 5, pp. 11–12, May, 1989. 相似文献
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A. S. Shapiro S. S. Panaiotti A. A. Artem’ev 《Chemical and Petroleum Engineering》2007,43(9-10):554-562
Information about cavitation characteristics of centrifugal pumps and critical cavitation conditions is given. Depending on the position of the leading edge, impellers are divided into three groups. The spatial lattice of the impeller is presented as a set of elementary lattices on the axisymmetric surfaces of a current of equal-velocity meridional flow. Equations have been derived from the determination of the cavitation margin and the equation of the energy in relative motion for the critical cavitation margin containing a cavitation coefficient referred to the impeller inlet. General equations have been obtained for the critical cavitaion coefficient of specific speed, which can be used to analyze the influence of geometric and operating conditions on the suction capacity of centrifugal impellers, which must be taken into account in designing them. The selection of the typical inlet diameter of the impeller has been substantiated and the critical cavitation coefficients of the elementary lattices have been found. An empirical equation, valid in the whole range of parameters encountered in practice, has been derived for the cavitation coefficient of type-3 impellers with a leading edge located roughly on the diameter of the impeller neck. An analytical equation, applicable for type-1 and-2 impellers, is given for the critical cavitation coefficient with empirical force coefficient values. A scheme for calculation of the suction capacity of such impellers is presented. 相似文献
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试验介质温度、粘度对螺杆泵容积效率的影响 总被引:2,自引:1,他引:1
通过对试验数据的分析及处理,得出了具有一般规律性的试验公式,建立了螺杆泵容积效率室内检测结果与井下泵容积效率的定量关系,提出了螺杆泵水力特性的检测指标。 相似文献
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多臂井径仪测量准确性及精度受多种因素影响,根据多臂井径仪测量原理并结合现场实际作业情况,从仪器机械结构、外部工作环境、现场作业条件及资料解释等多角度分析了影响测量精度的因素,并通过地面实验进行了验证。最后对这些影响因素影响程度加以分析,提出了降低或消除不利影响的方法和措施,现场应用效果较好,提高了测量精度。研究结果可以更好地指导多臂井径测量技术的现场应用。 相似文献
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定向钻井测斜仪的直线度对测量精度的影响 总被引:2,自引:1,他引:1
定向钻井测斜仪的直线度影响其测量精度。文章从误差基础理论出发,结合实际测试分析,得到测量误差变化规律,并引用正、余弦函数对误差进行校正。在条件允许时,可以通过最佳仪器短节的组合,尽可能使误差降低。 相似文献
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本文从煤矿测量出发,概述了全站仪的测量原理和使用方法,详细提出在煤矿测量工作中如何提高全站仪测量精度的策略,对提高全站仪测量效率、降低测量误差提供了很好的参考意见,具有一定的指导作用。 相似文献
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干气计量系统用于湿天然气计量会因气质含液而产生计量偏差,分析了现有湿天然气交接计量系统的准确度影响因素。利用某气田湿天然气交接计量站天然气组分的分析数据,对水蒸气造成的压缩因子计算偏差进行了实例分析。通过理论分析和实验研究,评估分析了孔板流量计和超声流量计在低含液条件下的湿天然气测量特性。为油气田区块合作湿天然气交接计量及相关标准的制定提供技术参考。 相似文献