Abstract The generation of a high velocity carrier gas flow for cold metal particle applications is addressed, with specific focus on titanium spraying. hardness this material makes spraying difficult to achieve by industry standard nozzles. redesign commercial conical convergent-divergent spray nozzle achieved the application aerospace design codes, based Method Characteristics, towards produc...

An in-house Pressure Sensitive Paint (PSP) formulation has been developed at the Aero-Physics Laboratory at the University of Manchester. The PSP uses Bathophenanthroline Ruthenium as the luminophore molecule and is incorporated in a sol-gel matrix. Excitation occurs at 400-500 nm and emission at 550-650 nm. The Stern-Volmer plot of the PSP reveals small temperature dependence, which has always...

Ejectors are known to be beneficial to vapor compression cycle performance as they can recover the kinetic energy released during the expansion instead of dissipating it in a throttling process. It is desirable to introduce an adjustable feature to the ejector so that ejector cycle performance can be optimized under different working conditions, which could make ejector technology more suitable...

Flow exiting a convergent-divergent nozzle operated at o -design conditions exhibits an instability that causes mixing enhancement in the ow itself and can destabilize an adjacent ow. The latter property enables mixing enhancement of an arbitrary jet via parallel injection of a secondary gas ow. In this study we investigated the e ect of mixing enhancement using secondary parallel injection (ME...

The supersonic convergent-divergent nozzles have many applications. An advanced design method must be used when the conditions are critical and wave-free stream must be reached. The characteristic method is a general technique in which the design of a nozzle can be achieved. Unfortunately, this technique can be performed only through a lengthy graphical procedure. The aim of this paper is to cr...

Abstract An optimisation study of a shock-wave-focusing geometry is presented in this work. The configuration serves as reliable and deterministic detonation initiator pulsed engine. combustion chamber consists circular pipe with one convergent–divergent axisymmetric nozzle, acting focusing device for an incoming shock wave. Geometrical changes are proposed to reduce the minimum wave strength n...

The space-time conservation element and solution element (CE/SE) method is used to solve the conservation law form of the compressible axisymmetric Navier-Stokes equations. The equations are time marched to predict the unsteady flow and the near-field screech tone noise issuing from an underexpanded circular jet. The CE/SE method uses an unstructured grid based data structure. The unstructured ...

An efficient finite volume approach has been used to develop a three dimensional Helmholtz acoustic solver for complex geometries. This acoustic solver was utilized to obtain characteristic mode shapes and frequencies of a baffled combustion chamber. An experimental setup, including stationary and moving sensors, has also been used to measure these quantities for the same model combustion chamb...

This paper reports a novel actuating design that uses the shear deformation of a piezoelectric actuator to deflect a bulge-diaphragm for driving an array microdroplet ejector. In essence, we employed a circular-shaped actuator poled radial direction with remnant polarization normal to the actuating electric field for inducing the piezoelectric shear effect. The array microdroplet ejector consis...