Measuring the velocities of particles in a shot-blasting chamber

作者：Bombek G^*; Hribernik A

来源：Measurement Science and Technology, 2010, 21(8): 085101.

DOI：10.1088/0957-0233/21/8/085101

• shot blasting
• wheel
• velocity
• particle
• measurement
• efficiency
• microphone
• overlapping

This paper presents a method for measuring the velocity of a flow of particles accelerated on a shot-blasting wheel and then expanding into space at a wide angle of approximately 45 degrees. The method uses the pulsed nature of the flow characteristic for turbo machinery with a finite number of wheel blades and calculates the velocity from the time shift between the particles hitting two targets at a known distance. This method does not depend on the material properties of the particles; however, a large number of particles is required for a successful measurement. The impacts are detected with a microphone covered by a steel membrane, making the exposed parts cheap and easily replaceable. This makes the method suitable for industrial test-and-development purposes, including the efficiencies of acceleration measurements. A cross-correlation of the signals was used, but the characteristic cycle (one rotation of the wheel) had to be determined beforehand by overlapping and averaging several cycles in order to compensate for the fact that different particles would be hitting the targets.

• 出版日期2010-8