Method for calculating cavitation performance of large-scale low-lift pump device

A low-lift pump and pump device technology, applied in pump control, non-variable-capacity pumps, machines/engines, etc., can solve problems such as lack of quantitative evaluation indicators

Active Publication Date: 2015-12-02
YANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is still no clear quantitative evaluation index and calculation method for the cavitation performance of large-scale low-lift pump devices. The cavitation specific speed expressing the cavitation performance of the pump itself is often used to evaluate the cavitation performance of the pump device. The center elevation of the pump impeller, which has a greater impact on performance, is mainly determined based on experience
This method is obviously subjective and one-sided, which seriously affects the quality of the anti-cavitation design of the pump device, and is very unfavorable for avoiding pump cavitation and cavitation erosion of the pump device to the greatest extent.

Method used

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  • Method for calculating cavitation performance of large-scale low-lift pump device
  • Method for calculating cavitation performance of large-scale low-lift pump device
  • Method for calculating cavitation performance of large-scale low-lift pump device

Examples

Experimental program
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Effect test

Embodiment 1

[0090] A large low-lift pumping station adopts an inclined shaft extension pump device, and the angle between the pump shaft and the horizontal plane is α = 15°; the model water pump TJ04-ZL-19 was initially selected in the preliminary design stage, and the impeller diameter of the model water pump is D m =0.3m, the rated speed of the water pump=1450r / min, the impeller diameter D of the prototype water pump of the preliminarily determined pump device p =3.55m, rated speed n p =112r / min, initially set the pump impeller center elevation . The pump impeller of the oblique axial extension pump device of this station has a large diameter, long running time and outstanding importance, and the anti-cavitation safety factor k of the pump device is required 抗空化 ≥[k 抗空化 ] = 1.40.

[0091] This embodiment is to apply the present invention to check whether the anti-cavitation safety factor of the pump device meets the requirements, and the steps are as follows:

[0092] 1. Number th...

Embodiment 2

[0146] A large low-lift pumping station adopts an inclined shaft extension pump device, and the angle between the pump shaft and the horizontal plane is α = 15°; the pump impeller of the inclined shaft extension pump device of this station has a large diameter, long running time and is of great importance. Anti-cavitation safety factor k of the pump device 抗空化 ≥[k 抗空化 ] = 1.40.

[0147] This embodiment is to apply the present invention according to the required pump device anti-cavitation safety factor [k 抗空化 ], select a suitable water pump for the pump device, and determine a reasonable water pump impeller center elevation, the steps are as follows:

[0148] 1. According to the design parameters and operating range of the inclined shaft extension pump device, TJ04-ZL-06, TJ04-ZL- 19 and TJ04-ZL-20 and other 3 model water pumps, they are numbered as l=1, 2, 3 in sequence; the impeller diameters and rated speeds of the 3 model water pumps converted to the corresponding proto...

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Abstract

The invention discloses a method for calculating cavitation performance of a large-scale low-lift pump device, and belongs to the technical field of hydraulic engineering pump stations. The method is mainly characterized by comprising the following steps: introducing pump device anti-cavitation safety coefficient which comprehensively considers influence factors such as water level of a water inlet tank, worst working condition points of pump device cavitation performance, water pump impeller center elevation, head loss of a water inlet runner, water pump cavitation performance and the like; taking the pump device anti-cavitation safety coefficient as a quantitative evaluation index of anti-cavitation performance of the large-scale low-lift pump device; and calculating the smallest anti-cavitation safety coefficient of the pump device according to three worst working condition points of pump device cavitation performance and the cavitation performance of each blade setting angle of the water pump. The method provided by the invention is clear, high in operability, capable of accurately calculating the cavitation performance of the pump device, can be used for quantitatively evaluating the cavitation performance of the designed pump device, and also can be used for selecting a proper model water pump and calculating reasonable water pump center elevation according to the anti-cavitation safety coefficient required by the pump device.

Description

technical field [0001] The invention belongs to the technical field of water conservancy engineering pump devices, and specifically relates to a method for calculating the cavitation performance of a large-scale low-lift pump device, which is mainly used for calculating, evaluating and adjusting the cavitation performance of a pump device in the preliminary design stage of a large-scale low-lift pump station, so as to ensure that the pump device The cavitation performance meets the requirements. Background technique [0002] Large-scale low-head pumps are widely used in many important fields such as water resource allocation, agricultural irrigation and drainage, water environment improvement, and urban flood control and drainage. How to ensure that the cavitation performance of large-scale low-head pumps meets the requirements is the key technology for the long-term and stable operation of pumps. At present, there is still no clear quantitative evaluation index and calcula...

Claims

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Application Information

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IPC IPC(8): F04D15/00
Inventor 陆林广陆伟刚徐磊练远洋施克鑫
Owner YANGZHOU UNIV
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