To reveal the pulsate dust-purging mechanism of plenum-type bag filter,the adiabatic energy equation based on aerodynamics is applied to the venting system,so as to drive theoretically the reverse air speed expression of bag filter surface in pulsate dust-purging process.

Design of a small measurable range wind speed and direction sensor

The information of wind speed and direction is important in the measure ment of weather condition.

The methods of wind speed and direction detection based on ultrasonic time-difference are introduced in the paper.

This paper describes the gradient wind observing systems architecture,the main hardware schematics,analysis of the characteristics of wind sensors,meteorological observations are given in line with the norms of the wind direction and speed algo- rithm,the algorithm is given to achieve the main source.

A wind velocity inversion method was developed based on a reference surface to overcome the deficiencies of the surveillance radar,such as low signal-noise ratios,low pulse recurrence frequencies,and excessive velocity aliasing.