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Method for calculating basic parameters of tubular turbine

A technology of tubular water turbines and basic parameters, which is applied in the direction of reaction engines, hydroelectric power generation, mechanical equipment, etc., and can solve problems such as different results, inability to select correctly, and large differences

Active Publication Date: 2017-12-22
POWERCHINA CHENGDU ENG
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Problems solved by technology

Because this estimation method is to estimate the basic parameters of the turbine according to statistical formulas, there are many such statistical formulas at present, because the sample data of the turbine parameters on which each statistical formula is based is before the 1970s and 1980s or at a certain water head section or is a specific speed n s range, there are certain limitations, the results estimated by different statistical formulas for the same hydropower project are different, and some even have large differences, so it is impossible to correctly select
Therefore, methods 1 and 2 cannot meet the requirements of hydropower engineering for the continuous development of new technologies, new materials, new processes, and new structures. The estimated specific speed of the turbine n s , unit speed n 11 and unit flow Q 11 Generally, it is also difficult to meet the new hydropower engineering requirements

Method used

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  • Method for calculating basic parameters of tubular turbine
  • Method for calculating basic parameters of tubular turbine
  • Method for calculating basic parameters of tubular turbine

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Embodiment Construction

[0021] The present invention will be further described by implementing examples below.

[0022] The statistical estimation formulas for basic parameters of tubular turbines commonly used at present mainly include ②n s =21000 / (H r +17)+35, ④n 11 =0.1n s +92, ⑥Q 11 =2.82×10 -3 no s +0.19, the following formulas (1)~(6) of the present invention and commonly used statistical estimation formulas ①~⑥ are applied in the sample data to obtain the errors of the calculation results of each formula and the true value, and Table 1~Table 3 are wherein several groups Comparison of sample data and its calculation error.

[0023] Table 1 Several sets of sample data (real parameters of the turbine)

[0024]

[0025] The present invention of table 2 is contrasted with the statistical estimation formula error commonly used at present (H max ≤20m)

[0026]

[0027] The present invention of table 3 is compared with the statistical estimation formula error commonly used at pres...

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Abstract

The invention relates to a water turbine of a hydropower station, and discloses a method for calculating basic parameters of a tubular turbine. The method has the advantage that the basic parameters of the tubular turbine can be calculated. The basic parameters, required to be calculated, of the tubular turbine include the specific speed ns, the unit speed n11 and the unit discharge Q11. The method comprises the steps that the rated head of the tubular turbine to be calculated is determined and is marked as Hr; the maximum apply head of the tubular turbine to be calculated is determined and is marked as Hmax, and the range which the Hmax is within is judged; and the basic parameters are calculated according to the calculation formulas of the corresponding range of Hmax, wherein the formulas are as follows: when Hmax is less than or equal to 20m, ns=2078.5Hr<-0.3648>, n11=3.4715ns<0.5808>, and Q11=2.4072Ln(ns)-13.617, and when the Hmax is greater than 20m, ns=2205.4Hr<-0.3994>, n11=6.2452ns<0.4951>, and Q11=2.6621Ln(ns)-15.396. The method is suitable for the tubular turbine.

Description

technical field [0001] The invention relates to a water turbine of a hydropower station, in particular to a method for calculating basic parameters of a tubular water turbine. Background technique [0002] A hydro turbine is a machine in a hydropower station that converts the mechanical energy of the water flow into the mechanical energy of the runner, so that the runner and the main shaft can run continuously against various resistances. It is called the "heart" of the hydropower station. The initial investment and the economic benefit of the power plant after it is put into operation play a very important role and are an important content of hydropower engineering design. [0003] Turbine specific speed n s It is a comprehensive index to measure the energy characteristics, cavitation characteristics, operation stability, economy and advanced nature of the turbine. Increasing the specific speed is of great significance to improve the energy characteristics of the turbine,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F03B3/04
CPCF03B3/04Y02E10/20
Inventor 董宏成田迅蒋登云孙文彬刘丁
Owner POWERCHINA CHENGDU ENG
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