Method for determining centrifugal pump full-condition theoretical lifts based on internal flow measurement

A determination method, a technique of internal flow measurement, applied in pump control, non-variable displacement pumps, machines/engines, etc., can solve problems such as not considering the influence of the peripheral speed at the impeller inlet

Active Publication Date: 2013-01-16
JIANGSU UNIV
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Problems solved by technology

[0003] So far, there has been no literature report on the method of determining the theoretical head of the centrifugal pump under all working conditions. Only some scholars have done research on the c

Method used

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  • Method for determining centrifugal pump full-condition theoretical lifts based on internal flow measurement
  • Method for determining centrifugal pump full-condition theoretical lifts based on internal flow measurement
  • Method for determining centrifugal pump full-condition theoretical lifts based on internal flow measurement

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Embodiment

[0026] (1) PIV experiments are used to measure the internal unsteady flow laws of centrifugal pumps under three working conditions.

[0027] For a double-vane centrifugal pump with a specific speed of 115.6, its performance parameters under three working conditions are: 0.8 times the design working condition Q 1 =27.56m 3 / h, H 1 =4.96m, n 1=56.32%; design conditions Q 2 =34.48m 3 / h, H 2 =4.50m, n 2 =58.48%; 1.2 times design conditions Q 3 =41.40m 3 / h, H 3 =4.03m, n 3 =57.89%.

[0028] 1) Selection of measurement area and tracer particles.

[0029] Select the middle section A-A of the impeller (such as figure 2 shown) is the measurement plane. The impeller rotates clockwise, the angular velocity ω is 10.5rad / s, the suction surface of the blade facing the tongue and the X Angle between axes θ =28°, such as image 3 shown. Six different phases are measured in each working condition, which are recorded as φ / 6, φ / 3, φ / 2, 2 φ / 3,5 φ / ...

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Abstract

The invention discloses a method for determining centrifugal pump full-condition theoretical lifts based on internal flow measurement. The process of the method includes using internal unsteady flow dynamic rules under different working conditions of a performance intercross valuation (PIV) experiment measurement centrifugal pump; calculating theoretical lifts of the centrifugal pump under different working conditions; using an overall optimization algorithm or combination to solve flow angle coefficients under the different working conditions, performing PIV measurement on internal flows of centrifugal pumps at different specific speeds and obtaining different flow angle coefficients k alpha 1, k alpha 2 and k alpha 3 at the different specific speeds and under the different working conditions, and utilizing a unitary linear regression method to build a relation between the flow angle coefficients and the specific speeds under the different working conditions and further build a centrifugal pump full-condition theoretical lift formula. According to the method, the centrifugal pump full condition theoretical lifts under the different working conditions can be calculated accurately, and a centrifugal pump full condition energy performance calculation model is built on the basis to optimally design a prior pump.

Description

technical field [0001] The invention belongs to the field of energy performance calculation of a centrifugal pump, and in particular relates to a method for determining the theoretical head of a centrifugal pump under full working conditions based on internal flow measurement. Background technique [0002] At present, the calculation of the theoretical head of a centrifugal pump is generally based on the premise that the circumferential component of the absolute velocity of the liquid at the impeller inlet is equal to zero. Under design conditions, the absolute liquid flow angle at the impeller inlet is close to 90°, so the circumferential component of the absolute liquid velocity at the impeller inlet of the centrifugal pump is small and can be assumed to be zero. For non-design conditions, especially small flow conditions, the absolute liquid flow angle at the impeller inlet is much smaller than 90°, but if it is assumed that the circumferential component velocity at the i...

Claims

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Application Information

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IPC IPC(8): F04D15/00
Inventor 刘厚林王凯袁寿其谈明高王勇董亮周孝华
Owner JIANGSU UNIV
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