Effect of Inner Nozzle Lip Thickness on Co-flow Jet Characteristics

Srinivasarao, T.; Murthy, I. Dakshina; Lovaraju, P.; Rathakrishnan, E.

doi:10.1515/tjj-2016-0004

Cited by 17 publications

(9 citation statements)

References 7 publications

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“…They found that the increase in primary nozzle lip thickness reduces the potential core length of the primary jet. The effect of lip thickness (with a value of 15 mm) on co-flowing jets (flowing through a co-flowing nozzle) was also investigated by Srinivasarao et al, 18 which has a similar finding. To analyze the co-flowing jets characteristics with varying lip thickness, and to study the characteristics such as static pressure behavior, Mach number variation, and near-field turbulence, co-flowing jets with lip thickness of 2 mm, 10 mm, and 15 mm were studied by Naren et al 19 They reported that co-flowing jets with finite lip thickness (such as 10 mm and 15 mm) are effective mixing promoters than co-flowing jets with lip thickness of 2 mm.…”

Section: Introductionmentioning

confidence: 83%

Influence of bypass ratio on subsonic and correctly expanded sonic co-flowing jets with finite lip thickness

Thanigaiarasu

Shankar²,

Rathakrishnan

2018

Proceedings of the Institution of Mechanical Engineers, Part G:

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The effects of bypass ratio on co-flowing subsonic and correctly expanded sonic jet decay have been studied experimentally. Co-flowing jets with lip thickness 1.0Dp (where Dp is the diameter of primary nozzle and is equal to 10 mm) with bypass ratios of around 0.7, 1.4, and 6.4 at primary jet exit Mach numbers 0.6, 0.8, and 1.0 have been analyzed. A single free jet equivalent to primary nozzle of the co-flowing nozzle was considered for comparison. Primary jet centerline total pressure decay, spread, and static pressure variation were investigated. The results show that the mixing of the high bypass ratio co-flowing jet with lip thickness 1.0Dp is superior to low bypass ratio co-flowing jet. Both lip thickness and bypass ratio have a strong influence on the co-flowing jet mixing. Bypass ratio 6.3 experiences a significantly higher mixing than bypass ratio 0.7 and 1.4. Selected jets were also investigated computationally. The computations capture the salient flow physics and reproduce well with the experiments.

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Section: Introductionmentioning

confidence: 83%

Influence of bypass ratio on subsonic and correctly expanded sonic co-flowing jets with finite lip thickness

Thanigaiarasu

Shankar²,

Rathakrishnan

2018

Proceedings of the Institution of Mechanical Engineers, Part G:

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“…Comparing to the single free jet, the core in the thin lip reduced to 45% and the thick lip core reduced to 58%. Similar work was conducted by Srinivasarao et al (2017) using a primary nozzle and secondary duct with lip thickness 3 mm (thin lip) and 15 mm (thick lip). The PCL decreased from 6 D p to 4 D p when the lip increases from 3 mm to 15 mm.…”

Section: Introductionmentioning

confidence: 89%

Numerical investigation of critical lip thickness of subsonic co-flowing jet

Shankar

Ganesan

Raja

et al. 2021

AEAT

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Purpose The effect of increasing lip thickness (LT) and Mach number on subsonic co-flowing Jet (CFJ) decay at subsonic and correctly expanded sonic Mach numbers has been analysed experimentally and numerically in this study. This study aims to a critical LT below which mixing enhances and above which mixing inhibits. Design/methodology/approach LT is the distance, separating the primary nozzle and the secondary duct, present in the co-flowing nozzle. The CFJ with LT ranging from 2 mm to 150 mm at jet exit Mach numbers of 0.6, 0.8 and 1.0 were studied in detail. The CFJ with 2 mm LT is used for comparison. Centreline total pressure decay, centreline static pressure decay and near field flow behaviour were analysed. Findings The result shows that the mixing enhances until a critical limit and a further increase in the LT does not show any variation in the jet mixing. Beyond this critical limit, the secondary jet has a detrimental effect on the primary jet, which deteriorates the process of mixing. The CFJ within the critical limit experiences a significantly higher mixing. The effect of the increase in the Mach number has marginal variation in the total pressure and significant variation in static pressure along the jet axis. Practical implications In this study, the velocity ratio (VR) is maintained constant and the bypass ratio (BR) was varied from low value to very high values for subsonic and correctly expanded sonic. Presently, commercial aircraft engine operates under these Mach numbers and low to ultra-high BR. Hence, the present study becomes essential. Originality/value This is the first effort to find the critical value of LT for a constant VR for a Mach number range of 0.6 to 1.0, compressible CFJ. The CFJs with constant VR of unity and varying LT, in these Mach number range, have not been studied in the past.

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“…Hasil penelitian tersebut menunjukkan bahwa lip thickness pada turncated nozzle terpancung sudut dalam dapat meningkatkan kestabilan api difusi. Srinivasarao [10] juga meniliti pengaruh lip thickness pada nozzle dengan model combuster concentric jet flow namun dengan geometri nozzle dan burner yang berbeda. Penelitian tersebut hanya terfokus pada hasil eksperimen dengan kecepatan fluida sonic jet dan subsonik.…”

Section: Pendahuluanunclassified

Pengaruh Lip Thickness Turncated Nozzle Sudut Luar terhadap Karakteristik Api Difusi Concentric Jet Flow

Huda

Widodo

Siswanto

2019

JRM

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Diffusion combustion is a daily combustion process where is often used primarily in industrial systems. An optimal burner design is needed to get more efficient combustion results. Then the shape of the burner nozzle greatly affects the turbulence between the fuel and air which forms the flow recirculation zone. The flow recirculation zone functions to produce homogeneous mixing and get a more perfect combustion. Recirculation zones are formed to disrupt flow rates, causing vortices and backflow around the end of nozzle. This research uses burner concentric jet flow. The lip thickness of the outer angles turncated nozzle are used 16 mm, 12 mm, 8 mm, 4 mm, and 0 mm length variation To obtain flame stability, the lift off and blow off limits are used with variations in air velocity. Thermocouples are used to measure the flame temperature distribution. The numerical simulations are used to reinforce this study. The results showed that the characteristics of the concentric jet flow diffusion affected by the use of the lip thickness of the outer angles turncated nozzle. The highest concentric jet flow diffusion stability is at 16 mm nozzle. The highest concentric jet flow diffusion temperature is at 12 mm nozzle. Experimental and numerical simulations show the perfect combustion on the 12 mm lip thickness nozzle. This can be seen by direct photographs of blue-dominated flames and the visualization of the temperature contour distribution which is dominated by red.

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Effect of Inner Nozzle Lip Thickness on Co-flow Jet Characteristics

Cited by 17 publications

References 7 publications

Influence of bypass ratio on subsonic and correctly expanded sonic co-flowing jets with finite lip thickness

Influence of bypass ratio on subsonic and correctly expanded sonic co-flowing jets with finite lip thickness

Numerical investigation of critical lip thickness of subsonic co-flowing jet

Pengaruh Lip Thickness Turncated Nozzle Sudut Luar terhadap Karakteristik Api Difusi Concentric Jet Flow

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