Heating of a tank gun barrel: numerical study

53 Pages·1.369 MB·English

by  Nathan Gerber, Mark L. Bund Y.

136
AD-A241
MEMORANDUM REPORT BRL-MR-3932
BRL
HEATING OF A TANK GUN BARREL:
NUMERICAL STUDY
DTIC NATHAN GERBER
MARK L. BUNDY
EIL ECTE
AUGUST 1991
AMOVED FOR PUBLIC RELEASE, DIRtL¶BUTION IS UNLMUTED. :(cid:127)c_777o
U.S. ARMY LABORATORY COMMAND
BALLISTIC RESEARCH LABORATORY
ABERDEEN PROVING GROUND, MARYLAND
91 9 30 040
NOTICES
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The findings of this report are not to be construed as an official Department of the Army position,
unless so designated by other authorized documents.
The use of trade names or manufacturers' names in this report does not constitute indorsement
of any commercial product.
UNCLASSIFIED__
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REPORT DOCUMENTATION PAGE
NO 07040-OI8
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1. AGENCY USE ONLY (Leave blank) 2. REPORT DATE 3. REPORT TYPE AND DATIS COVERED
IAugut 1991 Final. Feb -Feb 91
c. T0,E AND SUBTITLE S. FUNDING NUMBERS
Heating of a Tank Gun Barre: Numerical Study
PR: 1L.162618AH80
________________________________________
4. AUTI4OR(S)
Nathan Gerber and Mark L Oundy
7!.P ERFORMING ORGANIZATION NAME(S) AND ADORESS(ES) 8. PERFORMING ORGANIZATION
REPORT NUMBER
Army Ballistic Research Laboratory UL4 -33
-U.S.
ATTN: SLCBR-DD.T
Aberdeen Proving Ground, MD 21005-5068
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O. RUBEPOT OERTMIIS PAGEE OF ABSTRAC
I IUNCLASSIFIED
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NSN 7540-01 -Z8O.5500 UNCLASSIFI ED Standard Form 298 (Rev 2-89)
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TABLE OF CONTENTS
LIST OF FIGURES ........................................... v
ACKNOWLEDGMENT ......................................... Vil
1. INTRODUCTION ............................................. 1
2. FORMULATION OF THE PROBLEM .............................. 3
3. INPUT DATA ................................................ 7
3.1 Bore Temperature and Convective Heat Transfer ................... 7
3.2 Gun Properties and Ambient Conditions .......................... 9
4. FINITE-DIFFERENCE CALCULATION ............................. 10
5. ACCURACY CHECKS ......................................... 13
6. COMPUTATIONAL RESULTS ................................... 14
6.1 Energy Considerations ...................................... 14
6.2 Speed of Heat Penetration ................................... 18
6.3 Outer Wall Temperature: Slow Rate-of-Fire ....................... 18
6.4 Outer Wall Temperature: Fast Rate-of-Fire ................... 22
7. RELATION TO ANALYTICAL-EMPIRICAL MODEL .................... 22
8. DISCUSSION ................................................ 24
9. REFERENCES .............................................. 25
APPENDIX A: FORMULAS AND CONSTANTS ...................... 27
APPENDIX B: TIMESCALE SUBROUTINE .......................... 31
APPENDIX C: OUTLINE OF THERMAL LAYER METHOD .............. . 35
LIST OF SYMBOLS ........................................... 39
DISTRIBUTION LIST .......................................... 41
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IV
LIST OF FIGURES
FPauE
1a . Lengthwise Cross Section of M256 120-mm Gun Barrel
(Stretched Vertical Scale) ..................................... 3
lb. Transverse Cross Section of Gun Bazrel ............................ 4
2a. Bore Gas Temperature Histories at Two Axial Locations .................. 8
2b. Convective Heat Transfer Coefficient at Inner Wall of Gun
Barrel at Two Axial Locations .................................. 8
3. Grid Diagram for Numerical Solution ............................... 11
4. Inner Wall Temperature History for Test Problem: Numerical
and Analytical Results ........................................ 15
5. Heat Transferred to Gun Barrel in One Round: Numerical and
Experimental Results ........................................ 16
6. Heat Gain of Gun Barrel During FI.1ng of Round at z - 2.78 m ............ 17
7. Histories of Radial Heat Pulse Travel at Three Axial Locations ............ 19
8a. Slow Rate-of-Fire (t, - 4 min): Temperature Histories at z - 2.78 m ........ 20
8b. Slow Rate-of-Fire (t, - 4 min): Temperature Histories at z - 5.18 m ........ 20
9. Rise in Maximum Outer Wall Temperature Per Round: Numerical and
Experimental Results ....................................... 21
10. Fast Rate-of-Fire: Inner and Outer Wall Temperature Histories ........... 23
11. Outer Wall Temperature: Bundy Model and Experimental Results (Sequence of
4 Slow, 14 Rapid, 13 Slow Rounds) ............................. 24
1113 GRA&I
DTIC TAB 0
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ACKNOWLEDGMENT
The authors gratefully acknowledge the help received from the following indvkkidul
Mr. Paul Coniroy, Ballistic Research Laboratory, Interior Ballistics Division, who supplied the
input data filies of T. and h.; Mr. Joseph Cox, Bonet Laboratories. who supplied dat pon
which the authors based their specific heat; and Mr. James Bradley, Ballistic Research
Laboratory, Launch and Flight DWslon, whose programming assIstance was Invaluable.
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