An experimental investigation of underexpanded jets from oval sonic nozzles

Rajakuperan, E.; Ramaswamy, MA

doi:10.1007/s003480050176

Cited by 17 publications

(12 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In contrast, the jet boundary of the elliptic and rectangular jets in the major axis plane shrinks at first, and then expands along the streamwise direction. This behavior is mainly contributed to the axis switching effect that has been previously observed in the noncircular jets, including the square [13,14,29], elliptic [10][11][12], and rectangular jets [18,19]. Generally, the axis switching angle for the square jet is 45 deg, but takes a value of 90 deg for the elliptic and rectangular jets.…”

Section: Quasi-steady State Jetsmentioning

confidence: 95%

See 1 more Smart Citation

Flow characteristic of highly underexpanded jets from various nozzle geometries

Zhou

Yao

et al. 2017

Applied Thermal Engineering

View full text Add to dashboard Cite

Section: Quasi-steady State Jetsmentioning

confidence: 95%

“…For example, Rajakuperan and Ramaswamy [10] only presented in the major axis plane of the jets. Mitchell et al [11] presented the mean and fluctuating velocity profiles in underexpanded elliptic jets with an aspect ratio (AR) of 2.0 at NPR from 2.2 to 4.2 using planar particle image velocimetry (PIV).…”

Section: Introductionmentioning

confidence: 99%

Flow characteristic of highly underexpanded jets from various nozzle geometries

Zhou

Yao

et al. 2017

Applied Thermal Engineering

View full text Add to dashboard Cite

“…In 1998 further study of under-expanded jet flows from oval nozzles of AR=1.0, 1.4, 2.0, 2.9, and 5.0 was performed by Rajakuperan and Ramaswamy [23] in a pressure ratio range 2.3-20.3. They found that the higher pressure ratio increases the spreading rate in the minor axis, but has marginal effect on the spread rate in the major axis.…”

Section: Compressible Subsonic and Supersonic Plane Jetsmentioning

confidence: 99%

Plane hydrogen jets

Макаров

Molkov

2013

International Journal of Hydrogen Energy

View full text Add to dashboard Cite

This study is focused on understanding the structure and behaviour of hydrogen under-expanded jets from plane nozzles and their differences with circular nozzle jets. Results of numerical simulations of hydrogen highly under-expanded jets from a storage vessel at pressure 40 MPa through a circular nozzle and two plane nozzles with aspect ratios 5.0 and 12.8 respectively, all of the same cross-section area, are presented. Two stages approach is applied to simulate under-expanded unignited jets and jet fires. At the first stage, the high Mach number flow in a near field to the nozzle is simulated by compressible flow solver. At the second stage, incompressible flow solver is applied to simulated either unignited or combusting jets in the far from the nozzle field with "inner" boundary conditions taken from the first stage. The structure and behaviour of hydrogen plane highly under-expanded jets is scrutinised, including the switch-of-axis phenomenon when the exiting jet expands in the vicinity of the nozzle only in the direction of the minor nozzle axis while it contracts in the major axis direction. Simulations demonstrated that plane jets may provide faster concentration decay compared to axisymmetric jets with the same mass flow rate due to the difference in air entrainment. The concentration decay rate is shown to be a function of the plane nozzle aspect ratio. The eddy break-up model is applied to simulate under-expanded hydrogen jet fires from the equipment at pressure of 40 MPa. The circular and plane nozzle jet fire simulations are validated against experiments by Mogi and Horiguchi (2009). The simulations are in a good agreement with the experiment.

show abstract

“…The Schlieren method has been extensively used in experiments (Taghavi and Raman 1996;Rajakuperan and Ramaswamy 1998). Nouri and Whitelaw (1996) used a shadowgraph technique and laser Doppler velocimetry to investigate a gas-gas underexpanded jet and they observed entrained droplets.…”

mentioning

confidence: 99%

Entrained droplets in underexpanded gas jet in water

Someya

Uchida

et al. 2011

J Vis

View full text Add to dashboard Cite

A visualization study was performed to investigate the flow of an underexpanded nitrogen gas jet injected into water. The stagnation pressure was varied in the range 0.5-8.0 MPa. The gas jet length and expansion angle were obtained from time-averaged images captured using a high-speed camera. The gas jet length and expansion angle increased approximately linearly with increasing stagnation pressure. The entrainment velocity and the velocity of entrained water droplets in the gas jet were obtained by particle image velocimetry.

show abstract

An experimental investigation of underexpanded jets from oval sonic nozzles

Cited by 17 publications

References 13 publications

Flow characteristic of highly underexpanded jets from various nozzle geometries

Flow characteristic of highly underexpanded jets from various nozzle geometries

Plane hydrogen jets

Entrained droplets in underexpanded gas jet in water

Contact Info

Product

Resources

About