DETERMINATION OF THE THRUST SPREAD IN THE CYCLONE-4M FIRST STAGE MULTI-ENGINE PROPUSION SYSTEM DURING ITS START

Authors

DOI:

https://doi.org/10.15407/scine18.06.097

Keywords:

: liquid-propellant rocket engine, multi-engine liquid-propellant rocket launch vehicle, start, mathematical modeling, external and internal factors, and thrust spread.

Abstract

Introduction. The development of the Cyclone-4M space rocket complex is an important project of Ukraine space industry. In order to reduce the costs and the time inputs for the design and manufacture of liquid rocket engines (LRE) for the 1st stage of the Cyclone-4M launch vehicle, Pivdenne Design Office has employed the clustered multi-engine prototyped before as 1st stage sustainer engine.
Problem Statement. In a clustered multi-engine propulsion system, because of internal and external factors, individual engines do not start simultaneously. This may lead to dangerous spreads in the thrust of individual LREs in the course of the start of propulsion system, which can cause significant deviations of the launch vehicle motion from its trajectory within the initial time interval of the flight.
Purpose. The purpose of this research is to estimate the thrust spread as a result of the effect of internal and external factors on the transient processes in the individual engine systems and their dynamic interaction during the start of a multi-engine system of the Cyclone-4M first stage.
Material and Methods. The methods of automatic control theory, the impedance method, the statistical method and the methods for numerical simulation of non-stationary processes in pipeline systems of launch vehicles have been used.
Results. A mathematical model for start of multi-engine propulsion system of the Cyclone-4M first stage has been developed. It makes it possible to take into account the influence of spread of internal and external factors on the transient processes in a multi-engine system during the start of the engines. An effective method for determining the indicated thrust spread, which is based on the use of LPτ-sequences (Sobol sequences) that are sequences of multidimensional points whose uniform distribution is asymptotically optimal, has been developed. The transient processes in the RD-874 multi-engine propulsion system have been determined for various combinations of engine misalignments caused by external and internal factors. The lower and upper envelope curves of the time dependences of combustion chamber pressure have been plotted for each LRE in the multi-engine propulsion system.
Conclusions. The thrust spread and the spread of the time of reaching 90% thrust for RD-874 multi-engine propulsion system is significantly (about 2 times) smaller than that for individual RD-870 engine in this propulsion system.

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References

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Published

2022-12-01

How to Cite

PYLYPENKO, O., DOLGOPOLOV С., NIKOLAYEV, O., KHORIAK, N., KVASHA, Y., & BASHLIY, I. (2022). DETERMINATION OF THE THRUST SPREAD IN THE CYCLONE-4M FIRST STAGE MULTI-ENGINE PROPUSION SYSTEM DURING ITS START. Science and Innovation, 18(6), 97–112. https://doi.org/10.15407/scine18.06.097

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Scientific and Technical Innovation Projects of the National Academy of Sciences