نتایج جستجو برای: pulse combustion
تعداد نتایج: 120501 فیلتر نتایج به سال:
This paper presents symbolic time series analysis of observable process variables for anomaly detection in thermal pulse combustors. The anomaly detection method has been tested on the time series data of pressure oscillations, generated from a non-linear dynamic model of a generic thermal pulse combustor. Results are presented to exemplify early detection of combustion instability due to reduc...
For some decades, efforts have been made to exploit nonsteady combustion and gas dynamic phenomenon. The theoretical potential of nonsteady-flowmachines has led to the investigation of various oscillatoryflowdevices suchas pulse detonation engines, wave rotors, pulse jets, and nonsteady ejectors. This paper aims to provide a progress review of past and current research in developing a particula...
One of the important problems in reducing of pollutant emission from DI and IDI diesel engines is trade-off between soot and NOx. Split injection is one of the most powerful tools that makes the chance to shift the trade-off curve closer to origin. At the present work, the effect of split injection on the combustion process and emissions of a cylinder IDI diesel engine under the specification...
Hybrid femtosecond/picosecond coherent anti-Stokes Raman scattering (fs/ps CARS) offers accurate thermometry at kHz rates for combustion diagnostics. In high-temperature flames, selection of probe-pulse characteristics is key to simultaneously optimizing signal-to-nonresonant-background ratio, signal strength, and spectral resolution. We demonstrate a simple method for enhancing signal-to-nonre...
We have developed a new modeling capability to study the behavior of pulse combustors. Our approach is based on the use of higher-order Godunov methods combined with adaptive strategies to focus computational eeort where it is required and a Cartesian grid formulation for modeling realistic engineering geome-tries. The model computes quasi-one-dimensional, axisymmetric, and fully three-dimensio...
This computational study examines transient, reactive compressible flow phenomena associated with the pulse detonation wave engine. The PDWE is an intermittent combustion engine that relies on unsteady detonation wave propagation for combustion and compression elements of the propulsive cycle. The present computations focus on high order numerical simulations of the generic PDWE configuration w...
The efficiency of a jet engine is improved by increasing the temperature in the engine combustion components. Combustion chamber temperatures have increased up to 1600° C over the past decade. Therefore, jet engine combustion components must deal with high temperatures. Free-air-flow cooling holes are critical for cooling the components. But the process of drilling cooling holes has numerous pr...
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