GB/T 19068.3-2019Small wind turbines - Part 3: Wind tunnel test methods (English PDF)

1 Scope

This part of GB/T 19068 specifies the requirements for testing small wind turbines (hereinafter referred to as "units") in low-speed wind tunnels.

And methods.

This section is applicable to small wind turbines with an output power of less than 10 kW. The identification and evaluation of other forms of wind energy conversion devices are also

Can be used for reference.

2 Normative references

The following documents are indispensable for the application of this document. For dated references, only dated versions apply to this article.

Pieces. For undated references, the latest edition (including all amendments) applies to this document.

GB/T 17646 small wind turbine

3 terms, definitions and symbols

The terms, definitions and the following symbols defined in GB/T 17646 apply to this document.

CM. Wind wheel torque factor.

CM0. Wind wheel torque coefficient corrected without the amount of interference from the wall.

CP. Wind turbine utilization factor.

Cpi. The pressure coefficient corresponding to the i-th measuring point.

CP0. Wind turbine utilization factor corrected without the amount of interference from the tunnel wall.

CT. Wind wheel thrust coefficient.

CT0. Wind turbine thrust coefficient corrected without the amount of interference from the wall.

FL. Wind wheel tangential force, N.

FT. Wind wheel thrust, the axis of the wind wheel points backward, N.

I. Unit controller output current, A.

L. vertical distance between the tangential force line and the axis of the rotor, m.

LSS. distance between the center of the rotor and the geometric center of the cross section of the test section, m.

M. Wind wheel torque, N·m.

Ms. Wind wheel starting torque, N·m.

n. Wind wheel speed, r/min.

Pi. the pressure value corresponding to the i-th measuring point, Pa.

Pinfinity. test model far-away free air pressure static pressure, Pa.

P. Output power under standard atmospheric conditions at an altitude of 1000 m, W.

PN. Wind turbine mechanical output power under standard atmospheric conditions at an altitude of 1000 m, W.

Pt. static pressure test section of the wind tunnel test, Pa.

q. Speed test in the wind tunnel test section, Pa.