Analytical method based on influences of rotating speed changes on water turbine draft tube vortex strip
A speed change, draft tube technology, used in hydroelectric power generation, mechanical equipment, engine components, etc.
Inactive Publication Date: 2018-07-06
HARBIN INST OF TECH
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Problems solved by technology
[0004] In order to solve the existing technical problems, the present invention proposes an analysis method based on the influence of speed changes on the vortex belt of the draft tube of the hydraulic turbine
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[0035] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0036] The present invention proposes an analysis method based on the influence of speed change on the vortex belt of the draft tube of the hydraulic turbine, which includes the following steps:
[0037] Step 1. Select the operating point according to the conversion relationship between the runner speed and the unit speed, the turbine flow and the unit flow;
[0038] Step 2. Determine the information of each operating point according to the device ...
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The invention provides an analytical method based on influences of rotating speed changes on a water turbine draft tube vortex strip. The analytical method comprises the following steps that 1, working condition points are selected according to a conversion relation between the rotating wheel rotating speed and the unit rotating speed and a conversion relation between the water turbine flow rate and the unit flow rate; 2, information of the working condition points is determined according to the device cavitation number of a water pump water turbine model; 3, the shape of the draft tube vortexstrip is analyzed according to the information of the working condition points; 4, the flow line of the meridional plane of a draft tube, the flow line of the cross section of the draft tube, the vortex intensity of the cross section of the draft tube and the vortex intensity of the meridional plane of the draft tube are analyzed at the same moment T=0T<0> according to the information of the working condition points, wherein T<0> is the time needed by one circle of rotation of a rotating wheel, and the initial moment of the last three circles in the calculating process is taken as 0T<0>; and5, the energy recycling performance of the draft tube is analyzed according to the information of the working condition points.
Description
technical field [0001] The invention belongs to the technical field of the draft tube vortex of a water pump turbine, and in particular relates to an analysis method based on the influence of speed changes on the draft tube vortex of a water turbine. Background technique [0002] Due to the complexity of the flow inside the draft tube, although a large number of scholars have conducted related research on its flow process, no breakthrough has been made in theory, and no consistent conclusions have been drawn about the formation mechanism of the vortex zone. With regard to experimental research, the real machine test is generally less used due to reasons such as inconvenient operation and high cost, and the main focus is on the model test. In the test, a series of advanced equipment and methods such as high-speed camera, Doppler velocimeter and PIV technology have been put into use. The results of experimental research on the formation mechanism are still very limited. At p...
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IPC IPC(8): F03B11/00
CPCF03B11/00F03B11/008Y02E10/20
Inventor 宫汝志王洪杰陈阿龙李德友覃大清
Owner HARBIN INST OF TECH