A ground simulation method for helicopter rotor vortex ring recovery test

A helicopter rotor and ground simulation technology, applied in the field of wind tunnel test, can solve the problem of inability to control and guide the pilot

Active Publication Date: 2021-09-21
LOW SPEED AERODYNAMIC INST OF CHINESE AERODYNAMIC RES & DEV CENT
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Problems solved by technology

However, the above-mentioned studies are only to understand the aerodynamic characteristics and occurrence conditions of the helicopter vortex ring phenomenon, and have not yet studied how to simulate the recovery of the vortex ring state, and cannot give the pilot the necessary control guidance, and enable it to enter the vortex ring state. Timely and safe recovery

Method used

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  • A ground simulation method for helicopter rotor vortex ring recovery test

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Embodiment

[0031] A kind of helicopter rotor vortex ring state recovery test ground simulation method, such as figure 1 shown, including the following steps:

[0032] Step 1. Carry out the hovering test, obtain the change law of the rotor pull coefficient and the collective pitch, and determine the collective pitch control value corresponding to the different pull coefficients required by the test;

[0033] Step 2: Start the rotor test bench in the vertical descending state of the rotor, increase the rotor speed to the working speed, manipulate the rotor so that the pitch angle reaches the collective control value corresponding to the specified test pull coefficient in the hovering state, start the wind tunnel, and then Adjust the wind speed to different test values, collect data, and obtain the rotor aerodynamic load at each corresponding wind speed. After completion, gradually reduce the wind speed to zero, the rotor control angle returns to zero, and the rotor test bench stops;

[00...

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Abstract

The invention relates to a ground simulation method for a helicopter rotor vortex ring state recovery test, which belongs to the technical field of wind tunnel tests; the invention is mainly based on the domestic F5-meter vertical wind tunnel and its supporting helicopter vertical lift test bench, and is the first to propose a When the helicopter rotor is in the vortex ring state, the test method of simulating the recovery of the vortex ring through the rapid pull-up of the rotor collective pitch makes the test process standardized. Significant results are used to guide the pilot how to recover safely in time after the rotor enters the vortex ring state.

Description

technical field [0001] The invention belongs to the technical field of wind tunnel tests, and in particular relates to a ground simulation method for a helicopter rotor vortex ring recovery test. Background technique [0002] Since the early application of helicopters, it has been found that if the helicopter is inadvertently manipulated during vertical descent or steep descent, it will fall into a turbulent flow field, causing the helicopter to bump, fall rapidly, and control failure. If there is not enough height and timely and correct recovery measures, it will cause a crash accident. Its physical essence is that during vertical descent and steep descent, the rotor wake is blown back by the descending relative airflow, and a vortex ring is formed within a certain range of descent rate. The rotor is in an unstable large bubble, and the rotor stirs the air in the large bubble. Lift is reduced, unstable, and does not increase with power. The bubble breaks and closes at tim...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M9/02B64F5/60
CPCB64F5/60G01M9/02
Inventor 袁红刚黄明其杨永东彭先敏章贵川
Owner LOW SPEED AERODYNAMIC INST OF CHINESE AERODYNAMIC RES & DEV CENT
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