SAE AIR 984C-1997 Air Bleed Objective for Helicopter Turbine Engines《直升机涡轮发动机放气目的》.pdf
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1、SAE Technical Standards Board Rules provide that: “This report is published by SAE to advance the state of technical and enginee ring sciences. The use of this report is entirelyvoluntary, and its applicability and suitability for any particular use, including any patent infringement arising therefr
2、om, is the sole responsibility of the user.”SAE reviews each technical report at least every five years at which time it may be reaffirmed, revised, or cancelled. SAE invit es your written comments and suggestions.Copyright 1997 Society of Automotive Engineers, Inc.All rights reserved. Printed in U.
3、S.A.QUESTIONS REGARDING THIS DOCUMENT: (412) 772-8510 FAX: (412) 776-0243TO PLACE A DOCUMENT ORDER: (412) 776-4970 FAX: (412) 776-0790400 Commonwealth Drive, Warrendale, PA 15096-0001AEROS PACE INFORM ATION REPORTSubmitted for recognition as an American National StandardAIR984 RE V. CIssued 1969-04R
4、eaffirmed 1989-05Revised 1997-05Superseding AIR984BA ir B leed O bjective for H elicopter T urbine E nginesFOREWORDChanges in this revision are format/editorial only.1. SCOPE:This SAE Aerospace Information Report (AIR) defines the helicopter bleed air requirements which may be obtained through compr
5、essor extraction and is intended as a guide to engine designers.2. REFERENCES:There are no referenced publications specified herein.3. GENERAL:3.1 Bleed air on helicopter installations may be used as a source of heated air for the following purposes:a. Engine inlet de-icing and anti-icingb. Cabin co
6、nditioning and pressurizationc. Windshield de-fogging, de-frosting, and anti-icing3.2 A secondary use is for a small power source for driving one to two accessories and possible cross starting for multi-engine installation.SAE AIR984 Revision C- 2 -4. DISCUSSION:4.1 It is recognized that, in general
7、, compressor bleed air is an inefficient source of power. It is necessary, therefore, to limit bleed extraction to those uses in which an overall advantage to the helicopter will accrue. As a source of energy for those applications listed in and , bleed air performs a service that could otherwise re
8、quire considerably more equipment with increased weight, cost, size, and complexity; otherwise, its use should be limited to the conditions where the reduction in engine power is not detrimental to helicopter performance. This document is not all encompassing and the engine manufacturer should consi
9、der specific bleed air requirements for engine ground idle operation with the helicopter rotor locked.4.2 If the use of bleed air for cabin conditioning during hot weather proves desirable to overall helicopter optimization, it is recommended that engine designers consider anticipated compressor ble
10、ed air need.5. DEFINITIONS:5.1where:W BL = Weight of bleed air in pounds/hour (kg/s)C p = Specific heat at constant pressure in BTU/lb - F (KJ/kg - C)T BL = Bleed port air temperature, F (C)T ambient = Freestream air temperature, F (C)Bleed Energy = BTU/hour (KW)5.2 Assume sea level or note if other
11、wise.6. QUALITATIVE OBJECTIVE:6.1 To be acceptable for the purpose of cabin conditioning and pressurization, the bleed air must be free of detrimental contamination. The engine manufacturer should address the problem of bleed air contamination resulting from compressor bearing seal failures. This re
12、quirement is imposed on FAA certificated helicopters by FAR 29.831 (b) and (d). Approved test methods for assaying air samples may be obtained from one of the following:a. American Industrial Hygiene Association, 14125 Prevost, Detroit, Michigan - Request “Hygiene Guide for (name of substance).“b. “
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