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0 L~EVELIMEMORANDUM REPORT ARBRL-MR-03128

BURNING RATE DATA, LGP 1845

William F. McB U~ratny

August 1981 S SP2 9~

US ARMY ARMAMENT RESEARCH AND DEVELOPMENT COMMANDBALLISTIC RESEARCH LABORATORYV ABERDEEN PROVING GROUND, MARYLAND

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4. TITLE (and Subtitle) " ..3 F . ' PERIOD COVERED

/- BURNING RATE DATA, LGP 1845 . FINA1. '1 -r

y ~j4r~ ~ ~ :. -n NUMS-ER

.AUTHON.e 6-e- ~ 1At', T NUMBER(&)

WILLIAM F. cRTEIL..Jd••.•I• •AI•~rONNAME AND ADDRESS 10. PROGRAM EI.ZMEN4T0 PROJECT. TASKK

U.S. Army Ballistic Research Laboratory AREA & WORK UNIT NUMUERSATTN: DRDAR-BLI •• IAberdeen Proving Ground, MD 21005 161 YAH43

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Liquid PropellantBurning RateLGP 1845

"20. AJNIACr (cmtrau. e uevm • N nebb Wd ideatift by block nuimk**)

Burning rate data were obtained for the liquid propellant LGP 1845 overthe pressure range of 10 MPa to 100 MPa.

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TABLE OF CONTENTS

Page

I. INTRODUCTION 1..........................

II. DISCUSSION.. . . .................... ................... ....

III. CONCLUSIONS .. .. ... . ................ .......................... 6

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I. INTRODUCTION

As a part of the liquid propellant gun program, various candidatepropellants are being tested for i range of properties. During closed chambertests, a propell~ant identified a!; LGP 184. was determined to have a "visibletransition" near 20 MPa. It was requestad that burn rate data be obtainedfor this propellant in the isobaric windcwed chamber 2 and that observation bemade on the luminosity above the burning surface of the propellant.

II. DISCUSSION

Previously, work has been done on obtaining burning rate data on liquidpropellants in windowed chambers. By j.elling the propellant and burning itin rectangular cross-sectioned cells, photographic observation of the burningpropellant under nearly planar conditions may be obtained. By making thesample holder thin in the direction of observation, surface disturbancesgreater than 0.1 mm may be observed.

A sample of LGP 1845 was gelled with 2% (wt) Kelzan.* Sheet acrylicsample cells were acquired for the rz.tt: tests. These rectangu'ar cross-sectioncells were 1.5 mm by 6 mm in section. 2

A videco tape system+ was used to record the burn data. A millimeterscale was positioned behind the sample. Sample ignition was by a hot nichromewire at the surface.

The surface of this propellant, burning in the acrylic cells, has theappearance of plane segments inclired to the axis of the cell.. The burnfront is fairly flat but it is tilted relative to the axis of the cell as inFigure 1. This tendency has been obW,erved with cother propellants.2 The

burning rate data have been corrected for surface inclination by a cosinecorrection factor for burning rate a:i determined by the observed angle of theburning surface. It has been assumed that the burning occurs along aperpendicular to the gelled propellant surface. R V cos 8.

Figure 1. In(lined Burning Surface

1Kenton Travis, BRL personal com=:ni.ation, April 1980.

2 William F. McBratney, "Windowed Chanber Investigation of the Burning Rate ofLiquid Monopropellants for Guns", ABRL-MR-03018, April 1980. (AD #A086106)

*Kelzan is a polysaccharide gellirg agent from the Kelco Company.

-+The video tape was a Sony AV8600 with standard interlace timing (_60 Hz).

Si

Samples were burned over the pressure range of 7 MPa to 100 MPa. Figure

2 is a plot of the reduced data for these tests. In the neighborhood of 60MPa, the acrylic cells began to be disrupted during the test, and polypropylenestraws were used for the higher pressure tests. The slope change observed atpressures above 60 MPa occurred at pressures where the acrylic cells werebeing damaged and the polypropylene straws had to be used. The data above

60 MPa should not be interpreted as planar burn rate data until betterphotographic observations are obtained.

Luminosity observations were made with the video tape system. At 7 MPa,no luminosity was observed above the propellant sample. At 10.3 MPa, flashesof luminosicy were observed as streamers fluctuated in position and duration.At pressures of 60 MPa and higher, the luminosity was very bright and appearedcontinuous.

In order to see if the burning propellant was reacting with the acryliccell to produce the luminosity, a sample was burned in a glass tube at 60 Mpa.The luminosity obtained in this test appeared to be comparable with luminosityobtained in tests using acrylic cells.

III, CONCLUSIONS

In this sequence of tests the rate data curve was not observed to have achange in slope until pressures above 60 MPa were reached.. The variationoriginally encountered by Travis near 20 MPa corresponds to a change in flameluminosity which is first observed as luminous streamers at 10.3 MPa.

6

p. /ý

101

5+

2+

[...

2 01.64

* ACRYLIC CELL

k 4- POLYPROPYLENE STRAW

10 20 5o100i-.

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Figure 2. Burning late, LGP 1845 2% Keizan Gel

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REFERENCES

1. Kenton Travis, BRL personal communication, April 1980.

2. William F. MeBratney, "Windowed Chamber Investigation of the Burning Rateof Liquid Monopropellants for Guns", ARBRL-MPR-03018, April 1980.(AD #A086106).

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