Thus, a simple and effective flapper shape is proposed for cavitation reduction in the flapper-nozzle pilot stage of an electrohydraulic servo-valve.
The flapper-nozzle pilot stage, whose performance can be deteriorated by the generated flow cavitation phenomenon, is a vital segment in achieving precise control of electrohydraulic servo-valves.
Aiming to find out a reasonable flapper shape to reduce cavitation, this paper presents a numerical study of cavitation phenomenon in a flapper-nozzle pilot stage with different flapper shapes.
Also, the performance of other cooling tower elements, such as droplet separators and water spray nozzles, was investigated in the pilot experiments.
In the pilot stage of nozzle-flapper servo valve, the flow force on the flapper is the key reason that leads to forced vibration of the armature assembly, which may result in the fatigue of the flexure tube in torque motor.
The effectiveness of the Precessing Jet nozzle at yielding low NOx levels from burning coal was examined at the pilot scale.
The present work consisted of experimentally determining the volumetric mass transfer coefficient, kga, in a lab-pilot spray tower absorbing SO2, employing different operating conditions and two nozzle configurations, one involving the simultaneous use of a set of five spray nozzles and the other one, a single spray nozzle.
A pilot scale spray dryer (Buchi, B-191) with cocurrent operation and a two-fluid nozzle atomizer was employed for the spray drying process.
Optimum diameters for the pilot hole and the EDM electrode have been identified for a particular diameter of fuel injection nozzle, giving the minimum total drilling time and the best quality holes.
They say the planes would need to be refitted with specialized nozzles to disperse biological agents and would have difficulty carrying nerve gas without leaks that would kill the pilot or those who load the plane.
