Conjugate free convection with surface radiation from real-scale IRS system with multiple conical funnels: A numerical analysis

Chandrakar, Vikrant; Mukherjee, Arnab; Senapati, Jnana Ranjan; Mohanty, A. K.

doi:10.1016/j.icheatmasstransfer.2022.106004

Cited by 13 publications

(1 citation statement)

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“…Mukherjee et al [13] proposed a correlation between the mass inlet ratio and temperature ratio of outlet by investigating the geometric parameters of the Infrared Suppression System. Chandrakar et al [14] researched the comprehensive effect of free convection and surface radiation in infrared suppression devices and showed that surface radiation can influence the convection characteristics. Dash and Barik [15] studied this numerically by examining different parameters of the IRS device.…”

Section: Introductionmentioning

confidence: 99%

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2023

Brodogradnja

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The high-temperature exhaust gases and the hot surfaces of the ejector device in marine gas turbines generate significant levels of infrared radiation. An appropriate nozzle structure can effectively lower the exhaust gas temperature and reduce the high-temperature radiation surface area, thereby minimizing external infrared radiation. In this study, a numerical simulation of the nozzle structure in the ejector device was conducted using computational fluid dynamics (CFD) methods. By investigating the orthogonal combinations of nozzle inclination angles and the number of nozzles, the temperature distribution and flow characteristics under different operating conditions were analysed. The results showed that as the nozzle inclination angle increased, the entrainment coefficient (Ce) and the temperature ratio at the inlet and outlet (Rt) initially improved but then worsened. Simultaneously, the pressure loss coefficient (Cpl) increased with the inclination angle. The CRITIC weight method was employed to objectively allocate weights to Rt, Ce, and Cpl, determining the optimal solution. The results indicated that Rt and Cpl had significant and similar weights. The optimal solution was found in Case 10 (α = 5°, x = 4), with corresponding evaluation indices of Ce=2.38, Cpl=11.45, and =0.68. This study's findings are of great importance for enhancing the performance of marine gas turbines and reducing external infrared radiation.

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Section: Introductionmentioning

confidence: 99%