Effects of baffles and vortex generators on cooling performance of a gas turbine combustion chamber: Numerical assessment

Arjmandi, Hamed; Amini, Reza; Ghaffari, Ali; Rahmani, Hamid; Chamkha, Ali J.

doi:10.1016/j.aej.2021.10.005

Cited by 8 publications

(2 citation statements)

References 36 publications

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“…With the advancement of modern science and technology, the calibration technology of hydraulic turbines has made great progress. By optimizing the operation parameters and structural parameters of the steam turbine, the steam turbine can keep running continuously in the high efficiency zone and improve system efficiency [89][90][91]. Verbeek [92] found that the power coefficient of the turbine could be improved by optimizing the degree of blockage of the channel and the distance between the turbine and the structure, which was related to wake configuration.…”

Section: Effect Of Structure and Working Parameter Optimization On Th...mentioning

confidence: 99%

A Review of the Efficiency Improvement of Hydraulic Turbines in Energy Recovery

Song

Xue

et al. 2023

Processes

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Turbine energy recovery is a process energy saving technology, and understanding turbine efficiency has important operational and economic benefits for the operator of a power plant. There are three main areas of research into turbine energy efficiency: the structural performance of the turbine itself, the configuration of the recovery device and the regulation of operating conditions. This paper summarizes recent research advances in hydraulic turbine energy efficiency improvement, focusing on the design factors that can affect the overall efficiency of a hydraulic turbine. To quantify the impact of these factors, this paper investigates the effects of surface roughness, flow rate, head and impeller speed on overall efficiency. Methods for optimizing improvements based on these design factors are reviewed, and two methods, the Box–Behnken Design method and the NSGA-II genetic algorithm, are described with practical examples to provide ideas for future research.

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Section: Effect Of Structure and Working Parameter Optimization On Th...mentioning

confidence: 99%

A Review of the Efficiency Improvement of Hydraulic Turbines in Energy Recovery

Song

Xue

et al. 2023

Processes

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“…The blower sucks the hot air flow into the drying chamber connected with the Vortex Generator. The convection heat transfer that occurs can be improved by increasing the fluid flow velocity using a Vortex Generator so that the heat transfer area becomes wider [15]. According to the contact, spray dryers are classified as co-current, counter-current, and mixed flows [16].…”

Section: Theoretical Reviewmentioning

confidence: 99%

The Simulation of Fluid Flow with a Vortex Generator 35° toward the Y-axis to Heat Transfer in Spray Dryer

Setyadi

Anggrainy

Yoga

et al. 2022

J. Phys.: Conf. Ser.

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The Spray Dryer is a spray drying machine to change liquid into dry powder. The spray drying machine can be defined by the drying process in a cylinder, utilizing air heated in the heater and flowing through a blower connected to a vortex generator with an angle of 35° to the Y-axis. The vortex generator causes the formation of turbulence of airflow. Heat transfer occurs between the hot air flow and the milk droplets so that the liquid milk becomes a dry powder. This research aims to see the vortex phenomenon, namely the turbulence intensity, airflow velocity, heat flux, and temperature distribution in a cylinder, compared with an experiment that used four conditions of temperature inlet. There is 80°C, 90°C, 100°C and 110°C. The liquid used in this research is dairy cow’s milk mixed with water and maltodextrin, which has a density value of 1056 kg/m3 and a specific heat value of 3930 J/kg K. The machine’s cylinder has a diameter of 0.5 m with a wall thickness of 1 x 10−3 m and a height of 2 m with a capacity of 1.27 l/hour with a drying time of 80 minutes. The speed airflow of this machine into the cylinder has 16 m/s with a cross-sectional diameter of 9,5 x 10−2 m and a thickness of 1 x 10−3 m which has a debit of 0.11 m3/s. In addition, the injector used has a diameter of 2 x 10−4 m and a speed of 13,54 m/s with a flow rate of 4,5 x 10−4 kg/s with a spray angle of 45° u. Besides that, the analysis results show that the airflow turbulence area is in the form of a vortex so that the drying process of heat transfer that occurs between the product material and the airflow becomes faster.

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