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Dynamic entropy probe

A probe and dynamic technology, applied in the field of dynamic entropy probes, can solve the problems of easy contamination of hot wires, easy breakage, high airflow sensitivity, etc., and achieves low airflow angle sensitivity, reduced difficulty and cost, and high spatial resolution. rate effect

Active Publication Date: 2014-09-17
INST OF ENGINEERING THERMOPHYSICS - CHINESE ACAD OF SCI
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

First of all, the angle sensitivity of the probe is limited, the maximum can only reach ±12°, and it cannot be applied to the flow field with a large angle
The probe has a limited frequency response and cannot capture high-frequency signals
In addition, the hot wire is susceptible to contamination and is extremely prone to breakage due to the small diameter of the wire
Pneumatic thin-film entropy probes, pressure sensor chips and thin-film flowmeters are easily damaged, are more sensitive to airflow, and the probes are expensive to manufacture

Method used

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Embodiment Construction

[0039] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0040] The principle and design of the entropy probe mainly include: the dynamic total pressure probe technology developed by the applicant's research team, the static pressure hole and two high-frequency response Kulite pressure sensors and the hot-wire anemometer technology, and simultaneously measure the dynamics in the flow field. The total pressure, the static pressure of the flow channel inside the probe and the Ma number can be used to calculate the total temperature and finally the entropy.

[0041] The working principle of the probe is:

[0042] The entrance of the Kiel fairing is chamfered, and four axially symmetrical holes are opened on the rear wall. The Kiel fairing is the main structure of the probe head, ...

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Abstract

Disclosed in the invention is a dynamic entropy probe comprising a rectifying cover, a static vent, a first high-frequency response pressure sensor, a hotline hole, a total pressure tube, a rectifying cover hole, a pressure guiding tube, a second high-frequency response pressure sensor, a pressure sensor support, a hotline, a hotline support and a semi-infinite long flexible tube. According to the dynamic entropy probe, the flowing total pressure, static temperature and velocity can be measured dynamically, thereby obtaining the local entropy. Because the obtained entropy is the physical parameter for measuring the most reasonable internal flowing loss, the weight on the efficiency influence by the nonsteady flow loss and even the internal flow loss of the turbomachinery can be analyzed in a quantitative mode.

Description

technical field [0001] The invention relates to the technical field of unsteady flow field measurement and turbomachinery measurement, in particular to a dynamic entropy probe suitable for dynamic measurement of three-dimensional unsteady flow field. Background technique [0002] Entropy is the most reasonable quantity to measure flow irreversibility or loss, because it can intuitively analyze the weight of each flow loss on efficiency, and has nothing to do with the reference frame. Although great progress has been made in research to understand the mechanism of unsteady loss, the current understanding of dynamic entropy is still incomplete. One of the reasons is the lack of accurate measurement of dynamic entropy. [0003] The flow in turbomachinery is very complicated, and the measurement of entropy is relatively rare. Only a few people in the world have tried and succeeded. Ng and Epstein were the first to measure the entropy in a transonic compressor using a double hot...

Claims

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Application Information

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IPC IPC(8): G01M9/06
Inventor 杨林王偲臣李继超林峰
Owner INST OF ENGINEERING THERMOPHYSICS - CHINESE ACAD OF SCI
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