FLOW PERFORMANCE COMPARISON ALONG THE CENTERLINE IN STRAIGHT AND S-SHAPED DIFFUSER

Year 2020, Volume: 6 Issue: 1, 58 - 71, 06.01.2020

Hardial Singh

https://doi.org/10.18186/thermal.671147

Cited By: 3

Abstract

In this paper of the S-shaped diffuser with area ratio (AR) 1.5, an experimental investigation was conducted to analyze the effect of the change in curvature of a straight-wall diffuser. During this study, a Straight diffuser was changed in to a curved diffuser at different angles as their same upper and lower limbs (60/60, 90/90). Profile equations of diffusers were generated with the help of MATLAB/Simulink v2017a software. In this work centerline length is constant for all three profiles, Centerline length that’s utilized in the sector of circle and radius of curvature is calculated. S-shaped diffuser had a different unique angle with square inlet and a rectangular outlet. S-shaped diffuser CPR and CTL results compared with a straight walled diffuser with the different inlet velocity and Reynolds Number. These outcomes from this research obtained the coefficient of static pressure gain and coefficient of total pressure loss for the three profile of the diffuser (Straight, 60/60, and 90/90 S-Shaped Diffuser).

Keywords

Coefficient of Static Pressure Recovery, Coefficient of Total Pressure Loss, S-Shaped Diffuser

References

• [1]. Kline, S. J. Optimum design of straight-walled diffusers. Trans. ASME. (1959); Ser. D: 81(3): 321-331.
• [2]. Fox RW, Kline SJ. Flow regimes in curved subsonic diffusers. Journal of Basic Engineering. 1962 Sep 1; 84(3):303-12.
• [3]. Guo RW, Seddon J. The swirl in an S-duct of typical air intake proportions. The Aeronautical Quarterly. 1983 May;34(2):99-129.
• [4]. Guo RW, Seddon J. Swirl characteristics of an S-shaped air intake with both horizontal and vertical offsets. The Aeronautical Quarterly. 1983 May;34(2):130-46.
• [5]. Majumdar B, Mohan R, Singh SN, Agrawal DP. Experimental study of flow in a high aspect ratio 90 deg curved diffuser.1998:83-89.
• [6]. Johnston J, Johnston J. Diffuser design and performance analysis by unified integral methods. In33rd Joint Propulsion Conference and Exhibit 1998 Mar 1 (p. 2733).
• [7]. Saha K, Singh SN, Seshadri V, Mukhopadhyay S. Computational analysis on flow through transition S-diffusers: Effect of inlet shape. Journal of aircraft. 2007 Jan; 44(1):187-93.
• [8]. Lien FS, Leschziner MA. Computational modelling of 3D turbulent flow in S-diffuser and transition ducts. InEngineering Turbulence Modelling and Experiments 1993 Jan 1 (pp. 217-228). Elsevier.
• [9]. Thenambika, V., Ponsankar, S., & Prabhu, M. K. Design and flow analysis of S duct diffuser with submerged vortex Generators. International Journal of Engineering Research and Applications. 2016; 6(2): 79-84.
• [10]. Jessam RA, Al-Kayiem HH, Nasif MS. Flow control in s-shaped air intake diffuser of gas turbine using proposed energy promoters. InMATEC Web of Conferences 2017 (Vol. 131, p. 02006). EDP Sciences.
• [11]. Reichert BR, Wendt BR. Improving diffusing S-duct performance by secondary flow control. In32nd Aerospace Sciences Meeting and Exhibit 1994 Feb 1 (p. 365).
• [12]. Pradeep AM, Sullerey RK. Secondary flow control in a circular S-duct diffuser using vortex generator jets. In2nd AIAA Flow Control Conference 2004 (p. 2615).
• [13]. Anand, R. B., Rai, L., Singh, S. N. Flow and performance characteristics of 22.5 o/22.5 o S-Shaped circular diffuser. In Proc. of 28th National conference on FMEP Chandigarh, India. 2001.
• [14]. Anand RB, Rai L, Singh SN, Sharma OP. Flow characteristics of a low aspect ratio 90 deg/90 deg S-shaped diffuser. Journal of the Aeronautical Society of India. 2001 Nov; 53(4):239-52.
• [15]. Lefantzi S, Knight DD. Automated design optimization of a three-dimensional S-shaped subsonic diffuser. Journal of Propulsion and Power. 2002 Jul; 18(4):913-21.
• [16]. Gopaliya MK, Kumar M, Kumar S, Gopaliya SM. Analysis of performance characteristics of S-shaped diffuser with offset. Aerospace Science and Technology. 2007 Mar 1; 11(2-3):130-5.
• [17]. Gopaliya MK, Jain P, Kumar S, Yadav V, Singh S. Performance improvement of s-shaped diffuser using momentum imparting technique. Journal of Mechanical and Civil Engineering. 2014 Mar; 11(3):23-31.