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Method and device for determining the instantaneous mass flow of pulsating flows

A technology for determining devices and fluids, applied in the directions of mass flow measuring devices, measuring devices, measuring flow/mass flow, etc., can solve problems such as inappropriate control or adjustment of fuel injection devices, device sensitivity, vibration sensitivity, etc., to avoid incomplete Effects of combustion, improved efficiency, low cost

Inactive Publication Date: 2008-10-08
フレドリッヒーアレクサンドルーウニヴェルシテートエルランゲンヌーンベルク
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The cost of providing the means to perform LDA is high
In addition, such devices are sensitive, especially to vibrations, and are not suitable for controlling or regulating e.g. fuel injection devices in automobiles

Method used

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  • Method and device for determining the instantaneous mass flow of pulsating flows
  • Method and device for determining the instantaneous mass flow of pulsating flows
  • Method and device for determining the instantaneous mass flow of pulsating flows

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Experimental program
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Embodiment Construction

[0050] The theoretical basis of the method according to the invention will first be explained in detail below.

[0051] Derived by Lambossy (Lambossy, P. (1952), Oscillations forces d'un liquideincompressible et visqueux dans un tube rigide et horizontal. Calcul de la forcefrottement, Helv. Physica Acta 25, 371-386) derived for harmonic oscillations, sheet The formula for a fully expanded (volentwickelt) pipe flow can be extended to arbitrary time-varying pressure gradients, which can be represented by the following Fourier sequence:

[0052] ∂ P ∂ z = - ρ [ p 0 + Σ n = 1 ∞ ( p n e inωt + ...

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Abstract

The invention relates to a method for determining the instantaneous rate of the mass flow of a flow of a fluid pulsating periodically at a frequency f, said method comprising the following steps: a) a pressure gradient in the flow over a certain period (P) is determined, b) the harmonic amplitude of the pressure gradient is calculated by means of Fourier transformation, c) the frequency f and the time t are converted into dimensionless numbers F, t and d) the rate of the mass flow is determined using a table from which at least one corresponding value describing the mass flow rate and / or a phase difference can be deduced for each dimensionless number F of the frequency f.

Description

technical field [0001] The invention relates to a method and a device for determining the instantaneous mass flow in a pulsating fluid. Background technique [0002] By Uchida, "The Pulsating Viscous Flow Superposed on the Steady Laminar Motion of Incompressible Fluid in a Circular Pipe" of S.1956, J.Appl.Mat.Phys.(ZAMP), Vol.7, pp.403-422 discloses a An analytical method for arbitrary pulsating fluids. [0003] "Measurement of Instantaneous Flow Rates in Periodically Operating Injection Systems" Experiments in Fluids 20 (1996), pp. 178-188 by Durst et al. shows that Uchida's analytical method can be used to measure the The velocity of the pulsating fluid in the shaft. A measuring method based on this knowledge is also described, for example, in US Pat. No. 6,510,842 B2. However, the method based on the principle of LDA also has defects in many aspects. Analytical methods include Bessel functions, the solution of which is computationally expensive in practice. It is the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01F1/88G01F1/72
CPCG01F1/88G01F1/72
Inventor 比伦特·昂索尔迪莫塞尼斯·特里米斯弗朗兹·德斯特
Owner フレドリッヒーアレクサンドルーウニヴェルシテートエルランゲンヌーンベルク