A Coupled Thermochemistry-Interior Ballistic Model and Application to Electrothermal-Chemical (ETC) Guns

36 Pages·1.083 MB·English

by  Wren Gloria P., Oberle William F.

DTIC
AD-A261 639
4 ý1993
S MAR
A(cid:127)mY REsEARCH LABORATORY
A Coupled Thermochemistry-Interior
Ballistic Model and Application to
Electrothermal-Chemical (ETC) Guns
Gloria P. Wren
William F. Oberle
AL-TR-63 Februa 1993
* 93-04573
APRMOME FM PUUC RUSEASE DZUSDMfOI4 I UNLJMr=E.
8 3 051
NOTICES
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1. AGENCY USE ONLY (Leave blmnk) 2. REPORT DATE 3. REPORT TYPE AND DATES COVERED
I Febrrny ,993 Findh My 91 -Nov91
4. TITLE AND SUBTITLE S. FUNDING NUMBERS
A Coupied T-heO utSy-IIrsor Ballist-c Model and Applicaton to
Eedm~na iemical (EMC) Guns W D3O:S3
DA 31M8
It AUTHORWs)
Gloria P. Wrn and Wilimn F. Obede
7. PERFORMING ORGANIZATION NAME(S) AND ADDRESS(ES) 8. PERFORMING ORGANIZATION
REPORT NUMBER
U.S. Amy Rearcb Laboratory
ATMl: AMSRL-WT.PA
Aberdem Proving Ground, MD 21005-S066
t. SPONSORING/MONITORING AGENCY NAME(S) AND ADDRESS(ES) 10. SPONSORING/MONITORING
AGENCY REPORT NUMBER
U.S. Amy R L cbi y AhIL-T-63
AT .: AMRLOP-I-B (TeCh Li)
Aberdeen Proving Ground. MD 21005-5066
11. SUPPLEMENTARY NOTES
12a. DISTRIBUTION/AVAILABILITY STATEMENT 12b. DISTRIBUTION CODE
Approved for public relsae distribu(cid:127)on is unlimied.
13. ABSTRACT (Maximum 200 words)
In order Wp rovide a more accure description of di sawe of de propining gas in elm ero al-duemical WM Sim
simulaioms, h equili1ium mochmi code BLAKE has beem directly linked to a lumped peramew ntero ballit
(W) model and w invere model. The ivere model utilizes eprmenl msems m of pta.r pmojee pousimn,
and electrical emn input to infer the mas of propellam consumed at a unestap. In fte inmd model, computed value
of dfe space-mm presurm is supied dire-y to Zt codes, obvi(cid:127)t h need for impet and the ratio,o f secific hests
in fh calculation of energ. The link emd ocbemimy-IB models am discused and applied to exeimenial EX(cid:127) dm.
14. SUBJECT TERMS IS. NUMBER OF PAGES
26
interior bda electothermal combustion, thermochemisvy, inverse, guns 1. PRICE CODE
17. SECURITY CLASSIFICATION I$. SECURITY CLASSIFICATION 19. SECURITY CLASSIFICATION 20. LIMITATION OF ABSTRACT
OF REPORT OF THIS PAGE OF ABSTRACT
UNCLASSIFIED UNCLSIFDUM UNCL.SS D UL
NSN 7540-01-280-5500 Standard Form 298 (Rev 2-819)
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TABLE OF CONTENTS
LIST OF FIGURES .............................................. v
LIST OF TABLES ............................................... v
ACKNOWLEDGMENTS .......................................... vii
1. INTRODUCTION ............................................... 1
2. DESCRIPTION OF THE MODELS ................................... 5
3. COMPARISON WITH SOLID PROPELLANT MODEL .................... 6
4. COMPARISON WITH INVERSE MODEL .............................. 11
5. CONCLUSIONS ................................................ 13
6. REFERENCES .................................................. 15
DISTRIBUTION LIST ............................................ 17
Accesion For
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a
DTIC TAB
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Distribution i
Availabilit1y Codes
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LIST OF FIGURES
Page
1. Schematic of ETC guns ............................................ 2
2. Loading density history in a 120-mm simulation using IBHVG2 ............... 3
3. Energy vs. loading density vs. electrical energy density for a propellant
80% by mass of HAN and methanol in a stoichiometric mixture and
20% water ................................................... 10
4. Inverse model results for 30-mm titanium hydride and water firing ............. 12
5. Loading density vs. time for 30-mm titanium hydride and water firing
based on inverse model linked to BLAKE ............................. 13
LIST OF TABLES
Table Rae
1. Variable Thermochemical Properties for JA2 as a Function of Electrical
Energy Density ................................................ 2
2. Loading Density Dependence of Values for Thermochemical Properties
Computed BLAKE for JA2 Propellant ................................ 3
3. Gun Parameters Used in Simulation ................................... 6
4. Comparison of IBHVG2 and IBBLAKE for Simulation of 120-mm Gun
Using Single-Perforated JA2 Propellant ............................... . 8
5. Comparison of IBHVG2 and IBBLAKE for Simulation of 120-mm Gun Using
a HAN/Menthol/Water Mixture .................................... 9
6. Variable Thermochemical Values for 50% Ti H and 50% H 0 Plus Electrical
3 2 2
Energy atld = 0.2g cm 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
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ACKNOWLEDGMENTS
The authors would like to acknowledge the assistance of Dr. Eli Freedman, Eli Freedman and
Associate, Baltimore, MD, in providing a version of BLAKE suitable as a subroutine to an interior
ballistics model. The authors also wish to thank Dr. Paul Gough, Paul Gough Associates, Portsmouth,
NH, who participated in a discussion of several ideas explored in this report The comments of the
reviewers, Mr. Fred Robbins and Dr. Terry Coffee of the U.S. Army Research Laboratory, are gratefully
acknowledged. (NOTE: The U.S. Army Ballistic Research Laboratory was deactivated on 30 September
1992 and subsequently became a part of the U.S. Army Research Laboratory (ARL) on I October 1992.)
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