SAE J228-1995 AIRFLOW REFERENCE STANDARDS.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 engineering sciences. The use of this report is entirely voluntary, 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 invites your written comments and suggestions. QUESTIONS REGARDING THIS DOCUMENT: (412) 772-8512 FAX: (412) 776-0243 TO PLACE A DOCU
3、MENT ORDER; (412) 776-4970 FAX: (412) 776-0790 SAE WEB ADDRESS http:/www.sae.org Copyright 1995 Society of Automotive Engineers, Inc. All rights reserved.Printed in U.S.A. SURFACE VEHICLE 400 Commonwealth Drive, Warrendale, PA 15096-0001 RECOMMENDED PRACTICE Submitted for recognition as an American
4、National Standard J228 REAF. APR95 Issued1971-03 Reaffirmed1995-04 Superseding J228 JUN90 AIRFLOW REFERENCE STANDARDS ForewordThis reaffirmed document has been changed only to reflect the new SAE Technical Standards Board format. 1.ScopeThe purpose of this SAE Recommended Practice is to establish re
5、ference standards for airflow measurements in the ranges required for testing automotive engine induction systems and to describe equipment that will facilitate the use of such standards to check the accuracy of various equipment and methods. 2.ReferencesThere are no referenced publications specifie
6、d herein. 3.Airflow Nozzle DefinitionThe airflow reference system consists of a series of 10 nozzles called Calibration Transfer Nozzles, which are designed for operation at sonic flow velocities. Each nozzle is identified by a particular serial number and its nominal airflow, expressed in grams per
7、 second, at standard flow conditions. For this document, standard conditions are defined as: a.Air Pressure100 kPa ABS b.Exit Pressureless than 45 kPa ABS c.Air Temperature25 C d.Ambient Relative Humidity35% 3.1The nominal flow values established for the series of nozzles that should be used are: 1,
8、 5, 10, 15, 20, 25, 50, 100, 150, and 200 g/s. Typical outline dimensions and nozzle shape of an approved calibration transfer nozzle are shown in Figure 1. Nozzles produced for use in accordance with this document must be calibrated by a procedure which establishes an overall uncertainty (possible
9、bias plus three standard errors) with 0.2% of a primary standard traceable to the National Institute of Standards and Technology (NIST). SAE J228 Reaffirmed APR95 -2- FIGURE 1TYPICAL OUTLINES OF AIRFLOW CALIBRATION TRANSFER NOZZLE 4.Accessory Hardware and InstrumentationFigure 2 shows the nozzle hol
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- SAE J228-1995 AIRFLOW REFERENCE STANDARDS J228 1995
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