Effect of nozzle exit area on the performance of a turbojet engine

Sundararaj, Ramraj H.; Sekar, T. Chandra; Arora, Rajat; Kushari, Abhijit

doi:10.1016/j.ast.2021.106844

Cited by 10 publications

(2 citation statements)

References 37 publications

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“…Among them, compared with the other two internal combustion engines, differential internal combustion engines are the most widely studied 18,19 . Constant speed engines mainly have problems such as cooling, wear and so on 20,21 . Triangle rotor internal combustion engine due to the special structure form is difficult to achieve a good sealing effect, the current triangle rotor internal combustion engine combustion chamber adopts linear sealing structure, but there are still internal combustion engine burning oil, poor air tightness and other defects, based on the current problems of the triangle rotor internal combustion engine, it is difficult to solve it well by scientific means 22,23 …”

Section: Introductionmentioning

confidence: 99%

Study on combustion and emission characteristics of a micro‐rotary cam internal combustion engine

Zhu,

Yang,

Hao

et al. 2023

Engineering Reports

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In this article, the construction principle of rotary engine and sliding vane internal combustion engine is carefully analyzed, and the concept of micro‐rotary cam internal combustion engine is proposed by integrating and innovating on them. Overall design, theoretical analysis, and model making of miniature rotary cam internal combustion engine and its supporting system. The effects of different air intake modes and different ignition advance angles on the combustion and emission characteristics of internal combustion engines were studied. Through the study of the flow field, combustion and emission characteristics of small rotating internal combustion engines, it is found that the intake form has a great influence on the cylinder smoothness of rotating internal combustion engines. The vortex formed by the end cover inlet air in the middle of the combustion chamber can fully mix the fuel and air in the cylinder, and the mixture is evenly distributed in the combustion chamber to effectively promote the spread of flame. Compared with the surrounding air intake structure, the heat release should be increased by 4.3%, and the total amount of HC and CO generated was 26.8% and 15.7% less, respectively. By studying the turbulent kinetic energy, combustion heat release, peak temperature and pressure in the cylinder, fuel consumption rate and emission characteristics of small rotary internal combustion engine, it is found that when the ignition advance angle of the small rotating internal combustion engine is 5°, the peak pressure in the cylinder is increased by 2.3% compared with other schemes, the fuel consumption rate is high, and the combustion is more complete. In addition, in terms of emission characteristics, the amount of CO and HC generated when the ignition advance angle is 5° are reduced by 35% and 35.3%, respectively.

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Section: Introductionmentioning

confidence: 99%

Study on combustion and emission characteristics of a micro‐rotary cam internal combustion engine

Zhu,

Yang,

Hao

et al. 2023

Engineering Reports

View full text Add to dashboard Cite

show abstract

“…These devices are usually designed to optimally expand the gas at a particular operating point. The optimum expansion occurs when the aeroengine exhaust gas static pressure matches the ambient pressure, maximizing the produced thrust [1]. In the context of variable geometry, studies have shown that modifying the turbine nozzle can positively impact the fuel consumption [2] and reduce the exhaust emissions [3] when operating in off-design conditions.…”

Section: Introductionmentioning

confidence: 99%

Turbojet Thrust Augmentation through a Variable Exhaust Nozzle with Active Disturbance Rejection Control

Villarreal-Valderrama

Zambrano‐Robledo

Hernández-Alcantara

et al. 2021

Aerospace

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Turbojets require variable exhaust nozzles to fit high-demanding applications; however, few reports on nozzle control are available. The purpose of this paper is to investigate the possible advantages of an exhaust gas control through a variable exhaust nozzle. The control design method combines successful linear active disturbance rejection control (LADRC) capabilities with a loop shaping controller (LSC) to: (i) allow designing the closed-loop characteristics in terms of gain margin, phase margin and bandwidth, and (ii) increase the LSC disturbance rejection capabilities with an extended state observer. A representation of the nozzle dynamics is obtained from first principles and adapted to achieve a stream-velocity-based control loop. The results show that the resulting controller allows improving the expansion of the exhaust gas to the ambient pressure for the whole operating range of the turbojet, increasing the estimated thrust by 14.23% during the tests with experimental data.

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Influence of Multiple Parameters on the Efficiency of a Single Nozzle in a Heavy Gas Turbine Combustor

Hu,

Chen,

Meng

et al. 2024

Lecture Notes in Electrical Engineering

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Effect of nozzle exit area on the performance of a turbojet engine

Cited by 10 publications

References 37 publications

Study on combustion and emission characteristics of a micro‐rotary cam internal combustion engine

Study on combustion and emission characteristics of a micro‐rotary cam internal combustion engine

Turbojet Thrust Augmentation through a Variable Exhaust Nozzle with Active Disturbance Rejection Control

Influence of Multiple Parameters on the Efficiency of a Single Nozzle in a Heavy Gas Turbine Combustor

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