Investigation of the influence of co-flow velocity ratio on a compressible plane jet exhausting into parallel streams

Datta, Ajoy K.; Sinhamahapatra, K. P.

doi:10.1016/j.ast.2015.05.012

Cited by 5 publications

(1 citation statement)

References 42 publications

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“…Since 1950s, numerous authors have performed both experimental and numerical studies at low subsonic flow particularly less than 0.3 (Datta and Sinhamahapatra, 2015;Au and Ko, 1987;Ko and Kwan, 1976;Tkatchenko et al, 2006;Forstall and Shapiro, 1950;Dahm and Frieler, 1992;Rehab et al, 1997;Favre-Marinet and Camano Schettini, 2001). The primary variation in characteristics is based on varying density ratio (DR) (Favre-Marinet and Camano Schettini, 2001;Favre-Marinet et al, 1999), velocity ratio (Ko and Au, 1985;Au and Ko, 1987;Favre-Marinet et al, 1999;Favre-Marinet and Camano Schettini, 2001) and area ratio (AR).…”

Section: Introductionmentioning

confidence: 99%

Characteristics of a co-flowing jet with varying lip thickness and constant bypass ratio

Krishnan

2019

AEAT

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Purpose Subsonic commercial aircraft operate with turbo-fan engines that operate with moderate bypass ratio (BR) co-flowing jets (CFJ). This study aims to analyse CFJ with constant BR 6.3 and varying primary nozzle lip thickness (LT) to find a critical LT in CFJ below which mixing enhances and beyond which mixing inhibits. Design/methodology/approach CFJ were characterized with a constant BR of 6.3 and varying lip thicknesses. A single free jet with a diameter equal to that of a primary nozzle of the co-flowing jet was also studied for comparison. Findings The results show that within a critical limit, the mixing enhanced with an increase in LT. This was signified by a reduction in potential core length (PCL). Beyond this limit, mixing inhibited leading to the elongation of PCL. This limit was controlled by parameters such as LT and magnitude of BR. Practical implications The BR value of CFJ in the present study was 6.3. This lies under the moderate BR value at which subsonic commercial turbofan operates. Hence, it becomes impervious to study its mixing behavior. Originality/value This is the first effort to find the critical value of LT for a constant BR for compressible co-flow jets. The CFJ with moderate BR and varying LT has not been studied in the past. The present study focuses on finding a critical LT below which mixing enhances and above which mixing inhibits.

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Section: Introductionmentioning

confidence: 99%

Characteristics of a co-flowing jet with varying lip thickness and constant bypass ratio

Krishnan

2019

AEAT

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Investigation of the Influence of Convective Mach Number on Compressible Plane Jet Exhausting into Parallel Streams

Datta

Sinhamahapatra

2016

J. Inst. Eng. India Ser. C

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On the influence of co-flow on the shocks and vortex rings in the starting phases of under-expanded jets

2022

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The effect of co-flow or velocity ratio (Ua/ Uj) on the characteristics of primary vortex ring (PVR) in the starting under-expanded jets is investigated. With increase inco-flow (Ua/ Uj), the PVR circulation and it's vorticity decrease. The size of supersonicPVR gradually decreases with increase in co-flow (Ua/ Uj) and at high magnitudes ofco-flow (Ua/ Uj) it attains a circular shape. The strengths of embedded shock (ES) and vortex induced shock (VIS) are found to decrease with increase in co-flow (Ua/ Uj) and at high co-flow magnitudes these shocks may even cease to form inside the circularPVR. Increase in co-flow (Ua/ Uj) causes the expansion fan to become more and more narrow. This reduces the acceleration of the supersonic flow thereby weakening the strength of incident oblique shock, which in turn increases the pressure prevailing inside the inviscid core region downstream of this shock. The increase in co-flow(Ua/ Uj) also leads to a simultaneous decrease in the pressures prevailing in-front of the downstream marching PVR and Mach disk of the inviscid core due to the reduction in the strength of precursor shock. With increase in co-flow (Ua/ Uj), there occurs weakening of different shocks involved in Mach reflection which causes a reduction inthe strength of the resulting slip-stream. It is also shown that the increase in co-flow also affects the occurrence of Mach reflection and it's time-span. This study shows that co-flow (Ua/ Uj) governs the CRVR formation by affecting the occurrence, life span of Mach reflection and the slip-stream strength.

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Investigation of the influence of co-flow velocity ratio on a compressible plane jet exhausting into parallel streams

Cited by 5 publications

References 42 publications

Characteristics of a co-flowing jet with varying lip thickness and constant bypass ratio

Characteristics of a co-flowing jet with varying lip thickness and constant bypass ratio

Investigation of the Influence of Convective Mach Number on Compressible Plane Jet Exhausting into Parallel Streams

On the influence of co-flow on the shocks and vortex rings in the starting phases of under-expanded jets

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