A NOVEL GRAIN CONFIGURATION FOR DUAL THRUST SOLID ROCKET MOTOR USING TWO PROPELLANTS.

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Bibliographic Details
Title:	A NOVEL GRAIN CONFIGURATION FOR DUAL THRUST SOLID ROCKET MOTOR USING TWO PROPELLANTS.
Authors:	POPOVIĆ, Milan M.^1,2 mpopovicedepro@gmail.com, POPOVIĆ, Milivoje M.¹, ELEK, Predrag M.²
Source:	Thermal Science. 2025, Vol. 29 Issue 6B, p4693-4701. 9p.
Subjects:	Thrust, Solid propellants, Combustion kinetics, Propellants, Propulsion systems, Thermoplastics
Abstract:	This paper presents the design of a propellant grain for a dual-thrust solid rocket motor, combining slotted and end-burner grain geometries with two propellants of different burn rates. This novel approach achieves a high thrust ratio between the two-phases while ensuring nearly neutral burning throughout motor operation. Key performance parameters, such as chamber pressure and thrust, can be predicted analytically, with experimental tests demonstrating excellent agreement with theoretical models. The proposed design offers several advantages: neutral burning in both phases, a highly flexible and high thrust ratio, rapid pressure reduction during phase transition, minimal sliver formation, and quick motor extinction at the end of the second phase. Additionally, the use of thermoplastic propellant technology allows for the integration of multiple propellants within a single grain, providing versatility in using cylindrical-shaped grains for various applications. [ABSTRACT FROM AUTHOR]
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Database:	Engineering Source

Description
Abstract:	This paper presents the design of a propellant grain for a dual-thrust solid rocket motor, combining slotted and end-burner grain geometries with two propellants of different burn rates. This novel approach achieves a high thrust ratio between the two-phases while ensuring nearly neutral burning throughout motor operation. Key performance parameters, such as chamber pressure and thrust, can be predicted analytically, with experimental tests demonstrating excellent agreement with theoretical models. The proposed design offers several advantages: neutral burning in both phases, a highly flexible and high thrust ratio, rapid pressure reduction during phase transition, minimal sliver formation, and quick motor extinction at the end of the second phase. Additionally, the use of thermoplastic propellant technology allows for the integration of multiple propellants within a single grain, providing versatility in using cylindrical-shaped grains for various applications. [ABSTRACT FROM AUTHOR]
ISSN:	03549836
DOI:	10.2298/TSCI241230087P