Separated axle needle type prepeller wind gauge for measuring cylinder vortex

Abstract

The invention provides a separate-type axial-needle blade anemoscope measuring the vortex of the cylinder tube, the knock-down bush set on the inner side of the anemoscope body, the brackets of the circular axial-needle stand respectively set on two end surfaces of the inner side of the anemoscope body, and the adjustable axial-needle stand fixed on the midpoint of the thin knighthead fixed on the brackets, and two subulate points of the needle rotary axis set with the blade cooperating with the adjustable axial-pin stand; at least one opened hole right facing the blade set on the outer side,the approach sensor inserted in the hole and the rotary signal of the blade is output by the approach sensor.

Description

technical field [0001] The invention relates to an eddy current measurement device, in particular to a separate pintle blade anemometer for measuring cylinder eddy current. Background technique [0002] In many occasions, it is required to measure the rotation speed of the gas (air, etc.) macroscopic large-scale vortex. For example, the air flow conditions in the actual engine cylinder must be detected and diagnosed by means of simulation tests. In the research work of engine design and development, intake ports with different geometric parameters will produce different intensities of swirl in the cylinder, as well as different flow coefficients related to the size of the intake air. Only by testing the performance of the intake port on the steady flow test bench and obtaining parameters such as the swirl speed in the simulated cylinder, can it be possible to predict and determine the combustion conditions during the actual working process of the engine, and the possible im...

AI Technical Summary

Problems solved by technology

The vane anemometer is used for relatively comparative experiments on the measured objects, and has little effect, but it is not suitable for precise measurement

At the same time, this form of vane anemometer occupies a large volume and is not suitable for use in small bores.

[0004] The existing vane-type anemometers have the following technical deficiencies: the general rod-type structure, the head anemometer is bulky, and the resistance to air flow is greatly disturbed

The blade rotating shaft uses bearings, which have high frictional resistance, are easy to pollute, and have insensitive responses, which cannot meet the high performance requirements of the blade anemometer for measuring eddy currents.

The shape of the blade is uncoordinated, which is not conducive to absorbing the kinetic energy of the vortex, and the followability of synchronizing with the vortex is poor

This kind of anemometer has a large volume. In the test of measuring small-bore engines, it occupies a large proportion of space in the measuring cylinder, which destroys the structure of the original flow field, and the measurement results cannot truly reflect the flow characteristics of the intake port.

Therefore, the vane anemometer cannot be used, and only the expensive eddy flow meter can be selected (the import price is about 80,000 to 100,000 RMB, and the domestic production capacity, technology and other reasons cannot meet the requirements)

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