Analysis of dynamic characteristics and sensitivity of hydrogen-oxygen expansion cycle rocket engine system

Zhou, Chuang; Yu, Nanjia; Wang, Jue; Jin, Pengfei; Cai, Guobiao

doi:10.1016/j.actaastro.2021.08.046

Cited by 16 publications

(5 citation statements)

References 32 publications

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“…Gravity in pipes is not accounted for and the model is 1D with homogenous flow (no slip between the phases, homogenous temperature in the volume). The two-phase fluid obeys the Helmholtz energy law (as in [38]) for water mixtures. The Maxwell criterion is used to calculate the fluid saturation curve (as in [39]).…”

Section: A Numerical Simulation Modelmentioning

confidence: 99%

Energy Efficiency of the Vulcanization Process of a Bicycle Tyre

Pentakota¹,

Albertelli

Strano

2023

Int. J. of Precis. Eng. and Manuf.-Green Tech.

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The production of tyres is one of the most energy consuming manufacturing activities in the rubber sector. In the production cycle of a tyre, the curing operation has the maximum energy loss. This is mostly due to the extensive use of steam as a source of heat and pressure in the vulcanization process. To the author’s knowledge, no scientific work is available in the literature where the energy efficiency of a tyre vulcanization press is estimated by means of a comprehensive model of all main components, including the moulds, the press with its heated plates, the bladder and, of course, the tyre. The present work aims at filling this gap. First, the press used for developing the model is described, along with its components and its typical product, a bicycle tyre. The instruments used for measuring flow rates, temperatures and pressures are also listed. Then, a numerical model is presented, that predicts the energy transfers occurring in the vulcanization press during a full process cycle. The numerical model, developed with the software Simcenter Amesim 2021.1, has been validated by means of measurements taken at the press. The results indicate that the amount of energy which is actually consumed by the tyre for its reticulation process amounts to less than 1% of the total energy expenditure. The paper demonstrates that the tyre industry is in urgent need of an electrification conversion of the traditional steam-based processes.

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Section: A Numerical Simulation Modelmentioning

confidence: 99%

Energy Efficiency of the Vulcanization Process of a Bicycle Tyre

Pentakota¹,

Albertelli

Strano

2023

Int. J. of Precis. Eng. and Manuf.-Green Tech.

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“…where, Q is the volume flow, and N is the pump speed. According to the definition of θ and specific speed (N S ) in Equation ( 2), the head function (W H) and torque function (WT) are defined in Equation ( 3) [8].…”

Section: Electric Pumpmentioning

confidence: 99%

“…The turbine pump feed system uses the pump to pressurize the propellant, which greatly reduces the mass of the tank and improves the thrust chamber pressure. These engines have high specific impulse [7][8][9]. However, the structure of these engines is complex, generally including components such as gas generators, turbines, and centrifugal pumps.…”

Section: Introductionmentioning

confidence: 99%

Starting and Regulating Characteristics of Electric Pump Feed System for LRE under Different Schemes

Zhou

Wang

et al. 2022

Applied Sciences

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Liquid rocket engines (LREs) are essential power sources for access to space. Electric pump feed systems have received noteworthy attention because of their high efficiency, convenient regulation, and simple structure. In this study, an oxidant feed system with two pumps in parallel was established. The centralized parameter method and the distributed parameter method were used for modeling. The dynamic characteristics of different starting schemes and regulating schemes were obtained. The results show that the asynchronous opening of two pumps led to a pressure peak from the second stage to the third stage. Under the low operating conditions, the pump speed of the asynchronous scheme was about 13,300 r/min, the pump speed of the synchronous scheme was about 12,100 r/min, and the pump speed of the joint adjustment scheme was about 24,800 r/min. The joint adjustment of pump speed and valve opening could increase the pump speed by a factor of one-third, while maintaining the efficiency at a high level. The optimal scheme could be selected according to a genetic algorithm-based calculation process, together with the curves of the flow rate and pressure with pump speed and valve opening. This study can contribute to the application of electric pumps for liquid rocket propulsion.

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“…To ensure the atomization effect, the injector pressure drop is taken as 0.2 times of the combustion chamber pressure [2]. The pressure drop is mainly considering the valve, venturi and filter, etc.…”

Section: Engine Balance Parametersmentioning

confidence: 99%

“…Meanwhile, the turbopump feeding system is unqualified for repeated startups due to intricate structure and small range of thrust adjustment. The rocket engine with hydrogen peroxide and electric pumps is an important step toward a non-toxic, non-polluting and storable propellant system [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

Design and analysis of rocket engine system with electric pump as subsystem

Zhou

Wang

et al. 2022

J. Phys.: Conf. Ser.

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Electric pump feed systems use the high-speed and high-performance motor to replace the traditional turbine as the driving machine of pumps. A new feed system scheme is proposed in which a small-flow electric pump pressurizes hydrogen peroxide to the gas generator. The system keeps the performance of the engine at a high level, while being able to achieve continuous regulation and depth regulation. The balance calculation method and reliability allocation method are used. The results show that, the power of the electric pump for fuel path and oxidizer path is 600.0 W and 1732.6 W, respectively. The total mass of the engine is 69.76 kg, and the mass percentage of the electric pump system is small, less than 3.2% of the overall system mass. The effect of the electric pump system on the engine mass is small, but it improves the engine regulation capability. The reliability of this engine system is calculated to be 0.9802, which is not less than the target value of 0.98 with a certain margin, according to the reliability assigned to each combined part.

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Analysis of dynamic characteristics and sensitivity of hydrogen-oxygen expansion cycle rocket engine system

Cited by 16 publications

References 32 publications

Energy Efficiency of the Vulcanization Process of a Bicycle Tyre

Energy Efficiency of the Vulcanization Process of a Bicycle Tyre

Starting and Regulating Characteristics of Electric Pump Feed System for LRE under Different Schemes

Design and analysis of rocket engine system with electric pump as subsystem

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