Combustion Processes in Propulsion: Control, Noise, and by Gabriel Roy

By Gabriel Roy

Chemical propulsion includes the technology and know-how of utilizing chemical reactions of any variety to create thrust and thereby propel a motor vehicle or item to a wanted acceleration and velocity. This ebook makes a speciality of contemporary advances within the layout of very hugely effective, low-pollution-emitting propulsion structures, in addition to advances in checking out, diagnostics and research. It deals specific insurance of Pulse Detonation Engines, which upload super strength to jet thrust by way of combining excessive strain with ignition of the air/fuel mix. Readers will know about the advances cut back jet noise and poisonous gas emissions-something that's being seriously regulated by way of appropriate executive businesses. * Lead editor is among the world's preferable combustion researchers, with contributions from many of the world's major researchers in combustion engineering* Covers all significant components of chemical propulsion-from combustion dimension, research and simulation, to complex regulate of combustion approaches, to noise and emission regulate* comprises vital info on complicated applied sciences for lowering jet engine noise and dangerous gas combustion emissions

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The standard procedure until recently has been to implement the proposed strategies in "test combustors" that could duplicate a simplified model of the real combustor. The main difficulty with this procedure is that very often new and complex sensors and actuators must be developed for the purpose of such experiments. Furthermore, to monitor 21 22 CONTROL OF COMBUSTION PROCESSES the performance of test combustors one requires advanced diagnostics which are still limited in providing detailed information on turbulence, two-phase dynamics, and combustion.

XXXIV C O M B U S T I O N P R O C E S S E S IN P R O P U L S I O N Though the measured velocity field provides a fairly complete description of the flow physics in incompressible, nonreacting flows, information on an additional variable is usually required to understand and control compressible or reacting flows. To this eff'ect, Lourenco and his colleagues at Florida State University made simultaneous measurements of velocity and temperature fields in a premixed jet flame using particle image velocimetry (PIV) and laser speckle displacement (LSD) techniques (Chapter 1).

This makes the noise control methodologies development over the past decades for commercial aircraft either not applicable or less effective to military jet aircraft. Environmental concerns and regulations call for a substantial reduction in jet noise, whereas the complexity of the combustion-acoustic interactions makes the problem very challenging. As a result, innovative methods of reducing jet noise are investigated. A combined experimental and computational research program investigating the role of partial premixing and swirl on pollutant and noise emissions from aeropropulsion gas-turbine engines is being performed by Frankel and his coworkers at Purdue University (Chapter 1).

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