3 edition of Ejector noise suppression with auxiliary jet injection found in the catalog.
Ejector noise suppression with auxiliary jet injection
by National Aeronautics and Space Administration, National Technical Information Service, distributor in [Washington, DC, Springfield, Va
Written in English
|Statement||Charles H. Berman and Otto P. Andersen, Jr.|
|Series||NASA contractor report -- 202305., NASA contractor report -- NASA CR-202305.|
|Contributions||Andersen, Otto P., United States. National Aeronautics and Space Administration.|
|The Physical Object|
II. Jet Noise Suppression Jet exhaust is one of the dominant noise sources that dramatically increases with throttle push from modern turbofan engines.3 Jet noise can be attributed to the turbulent mixing of the hot jet exhaust (core), bypass stream (fan), and ambient air; therefore,File Size: KB. The jet ejector is classified into two types depending on its convergence configuration: 1. Constant-pressure jet ejector 2. Constant-area jet ejector The different between both types is shown in Figure 1. Figure 1. Jet ejector type. The jet ejector performance is mainly affected by mixing, turbulence, friction, separation, and energyCited by:
INSTALLATION, OPERATION, MAINTENANCE & TROUBLESHOOTING OF EJECTOR SYSTEMS BULLETIN # PVSESM PAGE 2 OF 18 The Unique “VIP” Service Advantage • Value, Integrity, Professionalism & Service • STEAM JET EJECTORS OPERATING PRINCIPLES Steam jet ejectors operate on a mass-velocity Size: KB. In aircraft, an ejection seat or ejector seat is a system designed to rescue the pilot or other crew of an aircraft (usually military) in an emergency. In most designs, the seat is propelled out of the aircraft by an explosive charge or rocket motor, carrying the pilot with concept of an ejectable escape crew capsule has also been tried. Once clear of the aircraft, the ejection seat.
Selection of Air Ejectors Part I. Basic design, operating information, and operation limitations of air ejectors. By: C.G. Blatchley Schutte & Koerting An ejector is a pump which uses the jet action of one fluid to entrain and compress another fluid. The high velocity primary stream File Size: KB. Novel Ejector System Eliminates Plates and Pins. Injection mold cost savings, greater molding productivity, and better part quality are promised for a new ejection system that does away with conventional ejector plates, housings, pins, and risers. This approach is said to reduce mold height, shorten mold-open times by at least 10%.
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Ejector Noise Suppression with Auxiliary Jet Injection AeroChem Research Laboratory, Titan Corporation P.O. BoxPrinceton, NJ An expe_nen_ program to reduce aircrai_ jet turbulence noise investigated the interaction of small auxiliary jets with a larger main jet.
Significant reductions in the far field jet noise were obtained over. Get this from a library. Ejector noise suppression with auxiliary jet injection: under contract NAS [Charles H Berman; Otto P Andersen; United States.
An experimental program to reduce aircraft jet turbulence noise investigated the interaction of small auxiliary jets with a larger main jet. Significant reductions in the far field jet noise were obtained over a range of auxiliary jet pressures and flow rates when used in conjunction with an acoustically lined : Charles H.
Berman and Jr. Otto P. Andersen. Gaseous injection reduces noise through jet plume modifications resulting from the introduction of streamwise vorticity in the main jet. In subsonic single-stream jets, air injection usually produces the largest overall sound pressure level reductions (roughly 2 dB) in the peak jet noise by: nozzle and an ejector reduce the aerodynamic noise of a jet still further.
In fact it has been found that even very short ejectors were effective complements of corrugated nozzles'.File Size: 3MB. However, the principle of jet exhaust noise reduction is the same as for the pure or low bypass engine, i.e., minimize the exhaust jet velocity within overall performance objectives.
High bypass engines inherently have a lower exhaust jet velocity than any other type of gas turbine, thus leading to. In Fig.
5, the efficiency of the ejector reaches a maximum at an inlet temperature ratio just above unity. This is the point where the temperature difference between the motive and entrained streams at the nozzle exit are minimum.
Also, the ejector area ratio is insensitive to the inlet temperature ratio. use a condenser on the final stage of an ejector system which dis-charges to atmospheric pressure. An aftercondenser. as it is commonly called, will serve to silence any noise that may issue from the discharge of the final stage.
An aftercondenser also elimi-nates the nuisance or objection of discharging steam in a confined area. In a liquid Jet Ejector, the motive fluid is a non-compressible liquid (generally water) with no heat energy hence with a single stage centrifugal pump we can not increase its pressure much.
As a result motive fluid velocity at the nozzle tip is very less and it affects its non-condensable load handling capacity a steam jet Ejector, the motive fluid is a jet of high pressure and. The term jet ejector describes a device in which a pumping effect is achieved using a motive fluid.
A jet ejector requires no mechanical drive and has no moving parts. This basic principle applies to every jet ejector in different models and ranges of application. The application determines the. Donald, P. and Gubbison, R. W., "Investigation at Supersonic and Subsonic Mach Numbers of Auxiliary Inlets Supplying Secondary Air Flow to Ejector.
Very simply, an ejector is a pumping device. It has no moving parts. Instead, it uses a fluid or gas as a motive force.
Very often, the motive fluid is steam and the device is called a “steam jet ejector.” Basic ejector components are the steam chest, nozzle, suction, throat, diffuser and they discharge (Fig.
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ejector efficiency, optimal design and control of ejectors and ejector systems. INTRODUCTION Suction nozzle Ejector has been widely used in different cycles for refrigeration purposes, such as recovery of expansion work, utilization of low-grade energy (solar energy, geothermal energy and waste heat).
Ejector expansion device isCited by: Steam jet ejectors are noisy, noise originated both from the body of the ejector and from the jet of vapours leaving the discharge nozzle.
Silencing by encasing the ejector body in acoustic insulation and by means of a silencer on the discharge is essential. A General Simulation of an Air Ejector Diffuser System Derick Thomas Daniel University of Tennessee - Knoxville, @ This Thesis is brought to you for free and open access by the Graduate School at Trace: Tennessee Research and Creative Exchange.
It has been. Steam jet air ejectors have a low initial cost, so are an economical means and reliable equipment for producing a vacuum.
The ejector design has basic advantages such as absence of moving parts and simplicity of operation. The conventional steam jet ejector has four parts: the steam chest, the nozzle(s), the mixing chamber, and the diffuser; Figure II/ illustrates ejector operation.
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A thorough understanding of the various compo. Reductions in Multi-component Jet Noise by Water Injection Thomas D Norum* NASA Langley Research, Hampton, VA, An experimental investigation was performed in the NASA Langley Low Speed Aeroacoustics Wind Tunnel to determine the extent of jet exhaust noise reduction that can be obtained using water injection in a hot jet Size: 2MB.
Jet pumps can be used for several different types of applications. Whether you are using a jet pump to supply water to your home from a water well or irrigate a garden, crops, or landscaping, you will need to know some common jet pump issues and identify ways to.
Operation and Maintenance of Ejectors. The steam-jet ejector is a device designed to convert the pressure energy of a motivating fluid to velocity energy in order to entrain the suction fluid and then recompress the mixed fluids by converting velocity energy back into pressure energy.2.
Efficiency of ejector noise-suppressing nozzles First we describe the results of investigations concerning the application of ejector noise-suppressing devices consisting of multi-element nozzles and ejector, in comparison with the reference axisymmetrical profiled nozzle on condition that jet.
To understand the problem of engine noise suppression, it is necessary to have a working knowledge of the noise sources and their relative importance. A typical combustion chamber injection system (1) A typical compressor inlet injection system (1) A typical fan cold stream thrust reversal system (1) rolls royce jet engine book (2.