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Hot line unit dry power calculation method and liquid water content calculation method based on hot line unit dry power calculation method

A technology of liquid water content and calculation method, applied in computer-aided design, calculation, material water content and other directions, can solve problems such as affecting measurement accuracy, difficult to fully establish core assumptions, defects, etc., and achieve the effect of overcoming low measurement accuracy

Active Publication Date: 2022-01-07
LOW SPEED AERODYNAMIC INST OF CHINESE AERODYNAMIC RES & DEV CENT
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, the above two methods have obvious defects
For the pico method, the airflow parameters will inevitably change during the experiment, so the core assumption of the method is difficult to be fully established, which will significantly affect the measurement accuracy
For the compensation method, although the change of dry power caused by the change of flow field parameters during the experiment can be effectively captured by adding the compensation hot wire, the temperature of the measurement hot wire unit and the calibration relationship between it and the compensation hot wire usually occur during the experiment. Certain changes, these changes will reduce the reliability of dry power obtained by this method

Method used

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  • Hot line unit dry power calculation method and liquid water content calculation method based on hot line unit dry power calculation method
  • Hot line unit dry power calculation method and liquid water content calculation method based on hot line unit dry power calculation method
  • Hot line unit dry power calculation method and liquid water content calculation method based on hot line unit dry power calculation method

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Experimental program
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Embodiment 1

[0048] This embodiment 1 provides a method for calculating the dry power of a hot line unit, including the following steps:

[0049] S10. Experimental collection of hotline unit dry air calibration data

[0050] Collect the power P of the hot wire unit and the temperature T of the hot wire under different working conditions under dry air conditions w , air velocity V a , air static temperature T s ; Select typical test conditions in this embodiment: air velocity V a =40m / s, 50m / s, 60m / s, 70m / s, 80m / s, 90m / s, 100m / s, static air temperature T s =-3°C, air static pressure Ps=1atm. Among them, the collected power of the hot wire unit under each speed condition is as follows: figure 2shown.

[0051] It is worth noting that the dry air condition means that the dry air flow field only contains air and does not contain cloud particles.

[0052] S20. Calculate the Nusselt number Nu of the hot line unit dry air:

[0053]

[0054] Among them, k is the heat transfer coefficien...

Embodiment 2

[0069] This embodiment provides a calculation method for liquid water content. During the cloud and fog test, the power of the hot wire unit P during the entire spraying process is collected. total , using the dry power calculated in Example 1 to calculate the liquid water content, such as figure 1 Shown:

[0070] The following formula is used to calculate the liquid water content LWC of icing clouds and fog:

[0071]

[0072] Among them, P total is the power of the hot wire unit measured in the cloud field, Ec is the liquid water droplet impact coefficient of the hot wire unit, Rc is the liquid water droplet evaporation ratio of the hot wire unit, Le is the latent heat of droplet evaporation, C l is the specific heat of liquid water, Te is the evaporation temperature of the droplet, and SV is the sampling volume of the hot wire unit;

[0073]

[0074] V a1 is the air velocity in the cloud field, d w is the diameter of the hot wire, and the calculation result of liq...

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Abstract

The invention is suitable for the technical field of icing wind tunnel tests, and provides a hot line unit dry power calculation method and a liquid water content calculation method based on the hot line unit dry power calculation method. The method includes the steps that calibration is conducted under the dry air condition, and the fitting relation between the hot line unit dry air nusselt number, a hot line Reynolds number and a dry air Prandtt number are obtained; the dry power of the hot line unit under the freezing cloud and mist condition can be calculated through the relation, and then the liquid water content is further calculated based on the dry power. By means of the method, refined calculation of the liquid water content of the icing cloud in the icing wind tunnel can be achieved, the technical problem that in the prior art, the measurement precision is low is effectively solved, and important technical support is provided for refined measurement of the icing cloud in the large-scale icing wind tunnel.

Description

technical field [0001] The invention relates to the technical field of icing wind tunnel tests, in particular to a method for calculating dry power of a hot wire unit and a method for calculating liquid water content based thereon. Background technique [0002] When an aircraft is flying in clouds, supercooled water droplets (ie, liquid water droplets whose temperature is below freezing point) in the clouds will continuously hit the windward side of the aircraft, causing the surface to freeze. Aircraft icing widely exists in flight practice and seriously threatens flight safety. [0003] The icing wind tunnel is an important ground test equipment for aircraft icing research and aircraft component anti-icing system verification, and it plays an important role in aircraft icing airworthiness certification. The ability to simulate the icing cloud and fog environment is the core content of the performance of the icing wind tunnel. Accurate measurement and evaluation of the mic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/15G06F30/20G01N25/56G01M9/06B64D15/20G06F111/10G06F119/06
CPCG06F30/15G06F30/20G01N25/56G01M9/06B64D15/20G06F2111/10G06F2119/06
Inventor 郭向东赵荣陈海李明易贤
Owner LOW SPEED AERODYNAMIC INST OF CHINESE AERODYNAMIC RES & DEV CENT
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