Military Jet Engine Acquistion: Technology Basics and by Obaid Younossi

By Obaid Younossi

Provides new observations to the cost-estimating database from ealier RAND experiences and offers a style for forecasting the advance fee, improvement time, and creation expense fo destiny army engine courses.

Show description

Read Online or Download Military Jet Engine Acquistion: Technology Basics and Cost-Estimating PDF

Similar military technology books

The Hamlyn Guide to Military Aircraft Markings

Identifies army plane markings and camouflage from global warfare I to the current day, in pocket-sized shape. every one representation has been chosen to teach how the markings and color schemes have advanced and the way they have been prompted via the aircraft's army position and project potential.

Trucks of the Wehrmacht

This publication covers the layout and kinds of assorted vans hired by means of the Wehrmacht.

Emergency action for chemical and biological warfare agents

Emergency motion for Chemical and organic conflict brokers, moment variation is meant for the 1st responder to the scene of the discharge of a chemical or organic battle agent. Formatted equally to the dept of Transportation’s Emergency reaction Guidebook and designed as a significant other to the author’s guide of Chemical and organic conflict brokers, this booklet is split into concise chapters that concentrate on the 1st few hours after the incident.

The B-1 Bomber - Aero Series 32

E-book through Holder, William G

Extra resources for Military Jet Engine Acquistion: Technology Basics and Cost-Estimating

Example text

Jet Engine Basics, Metrics, and Technological Trends 11 ting. Most early jet engines were turbojets. However, with some exceptions, such as some small and relatively inexpensive turbojets designed for one-time-use missile applications, modern jet engines have evolved into more-complicated devices called turbofan engines. A turbofan engine is more complex and more efficient than a turbojet. A turbofan adds a second compressor, called a fan, a low-pressure turbine to drive the fan, and an annular-shaped bypass duct that allows part of the fan’s discharge air to flow around the high-pressure compressor, combustor, and both turbines.

Prognostics and Engine Health Management Advanced engine health monitoring systems, including prognostics and diagnostics, along with electronic technical manuals, should reduce the total labor required to maintain engines and allow maintenance crews to plan for and accomplish preventative maintenance more effectively. The concept of monitoring engine performance has been around as long as engines themselves. However, the large advances in computing power, rugged and miniaturized sensors, artificial neural networks (ANNs),4 and diagnostic and prognostic algorithms will permit the incorporation of intelligent and responsive health assessment systems to improve engine reliability, predict degradation or failure, and prescribe corrective actions.

3—Turbojet and Turbofan Thrust-to-Weight Trends Since 1950 of air per second, or kg of air per second) is also an indication of the size of an engine and an indication of the size of inlet required. Overall pressure ratio (OPR) is the dimensionless ratio of the pressure of the air exiting the high-pressure compressor to the pressure of the air entering the fan on a turbofan engine, or entering the compressor on a turbojet, turboprop, or turboshaft. High OPR contributes to high engine efficiency and, in turn, low SFC.

Download PDF sample

Rated 4.20 of 5 – based on 29 votes