Experimental Investigations of Liquid Fueled Pulsejet Engines PDF Download
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Languages : en
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Various sizes of pulsejets are used to study the effects of heavy liquid fuels like kerosene and military grade JP-8. A hobby scale pulsejet, commercially available from Bailey Machine Services (BMS), is used with gasoline to verify data acquisition techniques, and attempts are made to use kerosene to fuel the jet to prove the viability of using kerosene to power pulsejet engines. A large valved pulsejet, predicted to deliver 25 lbs of thrust, is designed to be used with kerosene for initial testing to prove the feasibility of using such a propulsion device for personal troop transport. A 25 cm valveless pulsejet is designed, fabricated, and tested using propane, gasoline, and kerosene to determine if such an engine is practical for propelling a small, high speed Unmanned Aerial Vehicle (UAV) for military application. Temperatures, average and instantaneous combustion chamber pressure, sound pressure levels and jet operating frequencies were recorded at various fuel flow rates.
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Languages : en
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Book Description
Various sizes of pulsejets are used to study the effects of heavy liquid fuels like kerosene and military grade JP-8. A hobby scale pulsejet, commercially available from Bailey Machine Services (BMS), is used with gasoline to verify data acquisition techniques, and attempts are made to use kerosene to fuel the jet to prove the viability of using kerosene to power pulsejet engines. A large valved pulsejet, predicted to deliver 25 lbs of thrust, is designed to be used with kerosene for initial testing to prove the feasibility of using such a propulsion device for personal troop transport. A 25 cm valveless pulsejet is designed, fabricated, and tested using propane, gasoline, and kerosene to determine if such an engine is practical for propelling a small, high speed Unmanned Aerial Vehicle (UAV) for military application. Temperatures, average and instantaneous combustion chamber pressure, sound pressure levels and jet operating frequencies were recorded at various fuel flow rates.
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Category :
Languages : en
Pages : 68
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Author: Adam Paul Kiker
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Category :
Languages : en
Pages : 45
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Keywords: valved, valveless, micro-propulsion, pulsejets.
Author: Michael Alexander Schoen
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Category :
Languages : en
Pages : 125
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Book Description
Keywords: pulsating combustion engine, pulsejet, pulse jet, dynojet, resojet.
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Languages : en
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An experimental 8 cm pulsejet was developed using scaling laws from research on both 50 and 15 cm pulsejets. The 8 cm jet operates in three different inlet configurations--conventional, perpendicular, and rearward. The rearward configuration features inlets facing in the opposite direction of the flight path and develops the maximum net thrust. Using a high frequency pressure transducer, the operational frequency of the pulsejet was obtained by monitoring the combustion chamber pressure. It was found that in the rearward configuration, the operational frequency of the jet decreases with increasing inlet length. In addition, the combustion chamber peak pressure rise per cycle increases significantly if the exhaust diameter is reduced. Using information from the 8 cm pulsejet, a 4.5 cm pulsejet was developed and is operational.
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Languages : en
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The primary objective of this research was to experimentally validate the performance of the flares and find an optimal geometry. A computational model of the 50cm jet was used by was Tao Geng to investigate the fundamental principle and operation of a pulsejet with flares. He obtained results that noticed a significant increase in thrust for a particular Area Ratio (AR) and decreased as Area Ratio (AR) increased. This particular Area Ratio (AR = 2) of flare (Optimum) was greater than that of the Hobby Scale Jet, which had an Area Ratio of 1.4. Flares with various Area Ratios (AR = 2,1.4,3.24 and 1) were machined as attachments, which would fit onto the pulsejet, for investigation. Thrust, combustion chamber pressure and Thrust Specific Fuel Consumption (TSFC) were measured for all the cases and compared to the values for the Hobby Scale Pulsejet, to ascertain performance variations. Also experiments were done which included development of a reliable method of thrust measurement and implementation of this method for the augmenter studies on the 50cm pulsejet. Finally development of an unconventional conceptual pulsejet (based on Helmholtz Resonator) and operation of a 1 meter Valved Pulsejet is pursued.
Author: Mengyao Zhu
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Languages : en
Pages :
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The pulsejet is a type of jet engine in which combustion occurs in pulses. It was introduced to the world in the 1860s and the most famous previous application was the "V-1 buzz bomb" during World War II. Because of its high thrust to weight ratio, low cost and simple design, the pulsejet has recently received more research interest, like micro-scale propulsion devices for UAVs, or even large-scale propulsion devices for single stage to orbit Launchers.The objectives of this research include investigating the thrust a hobby scale pulsejet can deliver and its operating frequency, and develop a numerical simulation model for future study.This project investigated pulsejet operation in a combined numerical and experimental approach. The working mechanism of pulsejet engine was studied and a numerical simulation code based on a shock tube model with a quasi-one-dimensional assumption was built using second-order accurate Lax--Wendroff scheme. The code was capable of predicting flow parameters at various locations of the pulsejet engine with different lengths and diameters.A test bed with mounting clamps was manufactured; 10 tests were run on gaseous propane with assistance from an air compressor.The simulation model estimated the 40 cm pulsejet can deliver an average 4.18 N thrust with a 232 Hz operating frequency and the maximum instantaneous thrust was 32N. When the pulsejet was running on different fuel--air equivalence ratios, the working frequency was different. The load-cell was proved to be capable of detecting and recording each combustion events; and the operating frequency could be derived from the thrust data with high accuracy.
Author: Ranjith Kumar Abhinavam Kailasanathan
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ISBN:
Category :
Languages : en
Pages : 66
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Keywords: helmholtz resonator, exhaust flares, PIV, valved, pulsejet.
Author:
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Category : Aeronautics
Languages : en
Pages : 1134
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Author: Andrew Campbell Lee
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Category : Injectors
Languages : en
Pages : 324
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