... acoustic analogy are adopted to conduct all simulations. The results indicate that the combination of thickness and loading noise are the dominant noise sources at tonal peak frequency, and quadrupole noise has negligible influence. Rotational speed and receiver distance will significantly affect noise...

... j zCK 222222 , (8) where is coefficient of advance, is pitch ratio, z is number of blades, =A/Ad is disk ratio, 1111 iiii UTSC ,, 21 ji CV ,2 jS jjj VUT 222 ,, are polynomial coefficients of regressive database. Then there were determined by formulas (918) the rotational speed, torques...

... of the test section, which is coupled to a power servomotor through a torque transducer. The overall performance under steady flow conditions is evaluated by measuring the torque, the averaged flow rate, rotational speed of rotor and the total pressure drop between the settling chamber and atmosphere...

... vortex turbine asymmetric flow rpm valve 2 guidevane ocean energy unit rotational speed wave form cross-flow turbine flow condition output power efficiency torque detector available head renewable energy mean efficiency relation torque measurement rotational speed...

.... The tall fin is a wing following the tail" s motion and makes automatically pitching motion, the angle of which is decided by the balance between fluid force and some kind of elastic force of the muscle of the tall. swimming shaft rotational speed experimental study cam shaft mechanism...