Verification of Noise Forecast Capabilities for Application to Full-scale Supersonic-capable Jet Engine Development

2014 ◽  
Author(s):  
Wayne R. Lundberg ◽  
David Drye
Keyword(s):  
Full Scale ◽  
Jet Engine ◽  
Engine Development

Griffith’s Equation

2020 ◽  
pp. 249-266
Author(s):  
Brian Cantor
Keyword(s):  
Science Fiction ◽  
Second World War ◽  
World War ◽  
Jet Engine ◽  
The First World War ◽  
The Uk ◽  
Corner Cracks ◽  
Second World ◽  
First World ◽  
Engine Development

Most materials fracture suddenly because they contain small internal and surface cracks, which propagate under an applied stress. Griffith’s equation shows how fracture strength depends inversely on the square root of the size of the largest crack. It was developed by Alan Griffith, while he was working as an engineer at Royal Aircraft Establishment Farnborough just after the First World War. This chapter examines brittle and ductile fracture, the concepts of fracture toughness, stress intensity factor and stBiographical Memoirs of Fellows ofrain energy release rate, the different fracture modes, and the use of fractography to understand the causes of fracture in broken components. The importance of fracture mechanics was recognised after the Second World War, following the disastrous failures of the Liberty ships from weld cracks, and the Comet airplanes from sharp window corner cracks. Griffith’s father was a larger-than-life buccaneering explorer, poet, journalist and science fiction writer, and Griffith lived an unconventional, peripatetic and impoverished early life. He became a senior engineer working for the UK Ministry of Defence and then Rolls-Royce Aeroengines, famously turning down Whittle’s first proposed jet engine just before the Second World War as unworkable because the engine material would melt, then playing a major role in jet engine development after the war, including engines for the first vertical take-off planes.

Designing Clean Jet-Noise Facilities and Making Accurate Jet-Noise Measurements

2003 ◽  
Vol 2 (3) ◽  
pp. 371-412 ◽  
Author(s):  
K. K. Ahuja
Keyword(s):  
Frequency Response ◽  
Internal Noise ◽  
Jet Noise ◽  
Noise Spectrum ◽  
Full Scale ◽  
Research Facility ◽  
High Quality ◽  
Jet Engine ◽  
Noise Measurements ◽  
Noise Data

The main objective of this paper is to provide guidelines for designing and calibrating a high quality, static, jet-noise research facility and making high-quality jet noise measurements. Particular emphasis is placed on methodology for determining if internal noise is dominant in the jet noise spectrum. A section of this document is devoted to clarifying the terminology associated with microphone frequency response corrections and providing a step-wise description of other corrections that must be applied to the measured raw spectra before the jet noise data can be considered accurate and ready for use for extrapolation to full-scale jet engine noise.

The United Kingdom Engine Technology Demonstrator Program

1988 ◽  
Vol 110 (1) ◽  
pp. 17-22
Author(s):  
W. J. Chrispin
Keyword(s):  
Development Time ◽  
Government Funding ◽  
Full Scale ◽  
The United Kingdom ◽  
Technology Demonstration ◽  
Aero Engines ◽  
Will Power ◽  
The Uk ◽  
Engine Development ◽  
Technology Demonstrator

It is generally accepted that development time scales for civil and military aero-engines can exceed those of the airframe they will power. It is now essential to ensure that relevant engine technologies are conceived and proven ahead of commitment to full-scale engine development if future military and civil propulsion requirements are to be met in an affordable way. The scope and scale of UK demonstrator activity has been greatly expanded in recent years in recognition of this need, principally through increased government funding. This paper discusses the principles underlying technology demonstration including the circumstances pertaining in the UK, concluding that a comprehensive program of technology demonstration conducted in a step-by-step fashion and properly integrated with transition to full-scale engineering development will produce significant financial and operational benefits.

scholarly journals Operational and Maintenance Experience of an Industrial Type 14-MW Gas Turbine

1977 ◽  
Author(s):  
H. Werner ◽  
S. Ekman ◽  
H. Boltshauser
Keyword(s):  
Gas Turbine ◽  
Development Program ◽  
Jet Engine ◽  
Industrial Gas Turbine ◽  
Engine Development

The GT35, originally planned as a new step in the author’s jet engine development program, is a lightweight industrial gas turbine. This paper describes the operation, maintenance procedures, costs, problems and cures of several plants located in Sweden, Venezuela, Holland, Turkey and Algeria.

The Development of the Junkers Jumo 004B—The World’s First Production Turbojet

1997 ◽  
Vol 119 (4) ◽  
pp. 783-789 ◽  
Author(s):  
C. B. Meher-Homji
Keyword(s):  
Axial Flow ◽  
Vice President ◽  
Second World War ◽  
Historical Background ◽  
German Industry ◽  
World War ◽  
Jet Engine ◽  
The Face ◽  
Second World ◽  
Engine Development

This paper describes the pioneering work of Anselm Franz who, while working for the Junkers Engine company in Germany, designed and made operational the world’s first production jet engine, the Junkers Jumo 004, which was the powerplant for the formidable Messerschmitt ME 262 fighter. The paper covers the historical background of jet engine development in Germany during the Second World War and discusses design details of this remarkable axial flow, 1980 lb (900 kg) thrust engine. The development represented a historic achievement for Anselm Franz and his design team at Junkers. Approximately 6000 engines were built at the end of the Second World War in the face of acute shortages and damage to German industry. The Jumo was brought from conceptual design to production in a span of four years. Franz joined Avco Lycoming in 1952 and worked for 16 years. He retired as Vice President in 1968 after making prolific contributions to the development of several Lycoming engines including the T53, the T55, and the AGT-1500. Anselm Franz passed away at the age of 94 in Stratford, Connecticut. This paper is a modest tribute to a jet engine pioneer who, in spite of his extensive contributions to gas turbine technology, will always be remembered as the man who designed the world’s first production turbojet.

scholarly journals Particle emissions of two unblended alternative jet fuels in a full scale jet engine

Fuel ◽  
2019 ◽  
Vol 256 ◽  
pp. 115903 ◽  
Author(s):  
T. Schripp ◽  
F. Herrmann ◽  
P. Oßwald ◽  
M. Köhler ◽  
A. Zschocke ◽  
...  
Keyword(s):  
Full Scale ◽  
Jet Fuels ◽  
Particle Emissions ◽  
Jet Engine

Measurement of Near-Field and Far-Field Noise From Full Scale High Performance Jet Engines

2010 ◽  
Author(s):  
Richard McKinley ◽  
Robert McKinley ◽  
Kent Gee ◽  
Tony Pilan ◽  
Frank Mobley ◽  
...  
Keyword(s):  
High Performance ◽  
Noise Exposure ◽  
Near Field ◽  
Broad Band ◽  
Supersonic Jet ◽  
Full Scale ◽  
Far Field ◽  
Jet Engine ◽  
Field Noise ◽  
Non Linear Propagation

Accurate measurement of the noise fields emitted by a full scale high performance jet engine and jet plume (with supersonic jet flow) requires detailed planning and careful execution. The apparent acoustic source can be very large, more than 50 feet long and 20 feet high and wide. The jet plume contains many noise generating sources, the main two being shock (broad band and shock cells) and turbulent mixing. This paper is an initial description of a detailed method to accurately measure and describe the near-field noise while simultaneously measuring the far-field noise. For a large high performance jet engine, the acoustic far-field may not be formed until more than 1000 ft away from the plume. The paper also describes proposed methods to measure the non-linear propagation of the noise from the near-field to the far-field. The proposed methodology described with vetting will be considered as an US military standard (MILSTD) with possible later consideration as American standard measurement technique to describe noise fields for personnel noise exposure and for measuring the performance of jet engine noise reduction technologies.

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