Effect of Collar and Bevel Angle in Mixing Enhancement of Mach 1.76 Jet Exiting from a Convergent-Divergent Nozzle

Kumar, Bholu; Verma, Suresh Kant; Srivastava, Shantanu

doi:10.18485/aeletters.2021.6.1.1

Cited by 5 publications

(2 citation statements)

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“…Positions of the thermocouples are shown in the following Figure 3. Besides the mentioned parameters there are a lot of others, such as vibrations, temperatures at the nozzle and in front of the combustion chamber (Kumar et al, 2021), pressures behind the diffuser, compressor and nozzle and fuel flow. They were monitored by the same acquisition system, but they are not relevant for this research regarding lubrication of the bearing arrangement.…”

Section: Experimental Investigationmentioning

confidence: 99%

Influence of the air pressure and oil amount to the temperature of the high-speed bearings lubricated by oil mist

Stanković

Kolarević

Davidovic

et al. 2021

ILT

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Purpose The purpose of this paper is to improve the lubrication and remove as much as possible of the heat generated in the bearing assembly, embedded in the jet engine. Design/methodology/approach To determine the necessary values of the air pressure and oil amount, an experimental approach is used. For that purpose, a custom made test rig is developed. Findings Less amount of oil makes better lubrication conditions, reflected in the smaller temperature of the bearings. Concerning the air pressure, too high and too low air pressure deteriorates the lubrication parameters. An optimum value should be determined experimentally. The influence of oil amount is remarkably bigger than the influence of air pressure. Originality/value This experimental investigation provides an easy and fast way to improve the high-speed bearings lubrication parameters.

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Section: Experimental Investigationmentioning

confidence: 99%

Influence of the air pressure and oil amount to the temperature of the high-speed bearings lubricated by oil mist

Stanković

Kolarević

Davidovic

et al. 2021

ILT

View full text Add to dashboard Cite

show abstract

“…The best alternative which meets the above demands is only the computational work. The computational works on the jet were also carried out in the past but in limited quantity, [29][30][31][32][33][34][35][36][37][38][39] and thus, further computational investigations are required to look into the dynamics of free shear flow and the vortical structures in detail.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation of mixing performance for controlled supersonic jet

Kumar

Verma

Srivastava

2023

Proceedings of the Institution of Mechanical Engineers, Part G:

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In the present study, the mixing characteristics of the Mach 1.86 jet from a convergent-divergent nozzle of square cross-section from inlet to exit were investigated numerically. The jet studied were uncontrolled and controlled with limiting tab of rectangular and circular cross-sections. The nozzle pressure ratio is varied from 4 to 6 with a step size of one, leading to the confinement of the present study for the over-expansion and near correct expansion levels of the jet. It is observed that the core length, which is a direct indication of the extent of jet mixing, reduced significantly for the jet controlled with limiting tab as compared to that with the uncontrolled counterpart. Also, among the circular and rectangular limiting tabs, the tab with rectangular cross-section caused maximum core length reduction. The jet spread and the waves prevailing in the jet field were studied and visualized using pressure profiles and Mach contours, respectively. The present work may be used in understanding and solving complex phenomena occurring in the fields of aeroacoustics noise suppression, reduction of base heating of launch vehicles, supersonic combustion, mitigation of infrared radiations due to chimney smoke, etc., where jet mixing is highly desirable.

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Assessment of turbulent models for 2-D 30° bevel C-D nozzle for underexpansion condition

Singh,

Senthilkumar,

Kumar

2023

4th International Conference on Advances in Mechanical Engineering (Icame-2022)

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Effect of Collar and Bevel Angle in Mixing Enhancement of Mach 1.76 Jet Exiting from a Convergent-Divergent Nozzle

Cited by 5 publications

References 0 publications

Influence of the air pressure and oil amount to the temperature of the high-speed bearings lubricated by oil mist

Influence of the air pressure and oil amount to the temperature of the high-speed bearings lubricated by oil mist

Numerical investigation of mixing performance for controlled supersonic jet

Assessment of turbulent models for 2-D 30° bevel C-D nozzle for underexpansion condition

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