Optimization of pre-swirl nozzle shape and radial location to increase discharge coefficient and temperature drop

Lee, Hyungyu; Lee, Jungsoo; Kim, Donghwa

doi:10.1007/s12206-019-0926-5

Cited by 19 publications

(7 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Seoksu et al [14] studied the internal structure and static pressure of swirl nozzle, and the study showed that there was back ow vortex in the swirl atomization process, and the pressure drop inside the nozzle was larger under high injection pressure. Hyung yu Lee et al [15] carried out experiments on pass nozzles, and optimized the pass nozzles by CFD simulation, optimizing four design variables: nozzle inlet length, outlet length, inlet diameter and radial position. The results show that the optimized nozzle reduces the total pressure loss and increases the mass ow, and the optimized pre-swirl system reduces the aerodynamic loss, increases the mass ow rate under a certain pressure, and satis es the pressure margin of blade cooling.…”

Section: Introductionmentioning

confidence: 99%

Atomized droplet size prediction for supersonic atomized water drainage and natural gas extraction

Liu

2022

Preprint

View full text Add to dashboard Cite

In the late stage of natural gas reservoir exploitation, the energy of the gas reservoir decreases sharply, the wellbore pressure decreases, the liquid accumulation is serious, and the natural gas production decreases sharply. The influence of gas working parameters on the atomization effect and liquid carrying rate was established, and the physical model of the new atomizing nozzle was established. Through laboratory experiments, the experimental parameters of gas flow rate, liquid phase flow rate, liquid phase inlet diameter and average droplet diameter SMD were obtained. Then the BP neural network atomization model optimized by genetic algorithm is established, and the Matlab is used to train the 45 groups of data sets before the experiment. After the model training, the normalized atomization parameters are trained for sensitivity analysis. The relationship between the strength and strength of the factors affecting SMD is as follows: gas flow > liquid inlet diameter > liquid phase flow. The last 15 sets of data sets outside the training samples were tested by BP and GA-BP model, and the size of SMD was predicted. The experimental results show that the determination coefficient R2 of the established GA-BP network model to the experimental parameters is 0.979 and the goodness of fit is high; the MSE, MAE and MAPE of the predicted value of GA-BP atomization model and the experimental value are 4.471, 1.811 and 0.031 respectively, the error is small, the prediction accuracy is high, and the establishment of the model is accurate. The GA-BP model plays an important role in setting the working condition parameters and predicting the droplet size, and has a certain guiding significance for solving the problem of wellbore fluid accumulation and improving the drainage efficiency.

show abstract

Section: Introductionmentioning

confidence: 99%

Atomized droplet size prediction for supersonic atomized water drainage and natural gas extraction

Liu

2022

Preprint

View full text Add to dashboard Cite

show abstract

“…It was found that the optimal solution using RSM showed a higher discharge coefficient, which was 0.83 without considering the rotating effect. Lee et al (2019) optimized the hole type nozzle using the OLHD (Optimal Latin Hypercube Design) method and a genetic algorithm. It was shown that the discharge coefficient of the optimal model was 31.7% higher than that of the initial model by optimizing the angle of convergence and reducing the blockage effect.…”

Section: Introductionmentioning

confidence: 99%

Design optimization of a vane type pre-swirl nozzle

Lee

Park

et al. 2021

Engineering Applications of Computational Fluid Mechanics

Self Cite

View full text Add to dashboard Cite

Pre-swirl system is installed to minimize energy loss between the stationary and rotating parts of turbine secondary air system. Although various optimization studies were conducted to increase the pre-swirl efficiency, most of the studies were focused on a hole type pre-swirl nozzles. In this study, a vane type pre-swirl nozzle was optimized to increase mass flow rate and temperature drop for given boundary conditions. The system performance was analyzed by 3D CFD and the objective functions were used to maximize the discharge coefficient and the adiabatic effectiveness. After sensitivity analysis, seven design variables were chosen on the three planes of nozzle span-wise direction. The OLHD method was used to obtain the initial scattered test points, and the additional ones were supplied by the ALHD method. The Kriging model was constructed as the surrogate one, and refined iteratively until satisfying the convergence criteria between the estimated point and the CFD result. The optimized model improved the span-wise uniformity of the flow path and the discharge coefficient was increased by 2.57%, whilst the adiabatic effectiveness remained nearly constant. The performance was also analyzed for pressure ratio and off-design points, with the optimized model showing better performance at all boundary conditions.

show abstract

“…On this basis, some optimization studies for the nozzle and receiver hole have also been carried out to improve the performance of the pre-swirl system. [38][39][40] Xia et al 41 investigated a novel design of the pre-swirl system with dual-row pre-swirl nozzles, and they evaluated the temperature and mass flow rate characteristic of the novel system. According to three-dimensional (3-D) numerical simulations for a pre-swirl system, [42][43][44] the interface in the rotor-stator cavity is suggested to apply the frozen-rotor method instead of the mixing plane method in the steady-state calculations.…”

Section: Introductionmentioning

confidence: 99%

Effect of pre-swirl nozzle closure modes on unsteady flow and heat transfer characteristics in a pre-swirl system of aero-engine

Liu

Lei

Lin

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part G:

View full text Add to dashboard Cite

The pre-swirl system is of great importance for temperature drop and cooling air supply. This study aims to investigate the influencing mechanism of heat transfer, nonuniform thermodynamic characteristics, and cooling air supply sensitivity in a pre-swirl system by the application of the flow control method of the pre-swirl nozzle. A novel test rig was proposed to actively control the supplied cooling air mass flow rate by three adjustable pre-swirl nozzles. Then, the transient problem of the pre-swirl system was numerically conducted by comparison with 60°, 120°, and 180° rotating disk cavity cases, which were verified with the experiment results. Results show that the partial nozzle closure will aggravate the fluctuation of air supply mass flow rate and temperature. When three parts of nozzles are closed evenly at 120° in the circumferential direction, the maximum value of the nonuniformity coefficient of air supply mass flow rate changes to 3.1% and that of temperature changes to 0.25%. When six parts of nozzles are closed evenly at 60° in the circumferential direction, the maximum nonuniformity coefficient of air supply mass flow rate changes to 1.4% and that of temperature changes to 0.20%. However, different partial nozzle closure modes have little effect on the average air supply parameters. Closing 14.3% of the nozzle area will reduce the air supply mass flow rate by 9.9% and the average air supply temperature by about 1 K.

show abstract

Optimization of pre-swirl nozzle shape and radial location to increase discharge coefficient and temperature drop

Cited by 19 publications

References 17 publications

Atomized droplet size prediction for supersonic atomized water drainage and natural gas extraction

Atomized droplet size prediction for supersonic atomized water drainage and natural gas extraction

Design optimization of a vane type pre-swirl nozzle

Effect of pre-swirl nozzle closure modes on unsteady flow and heat transfer characteristics in a pre-swirl system of aero-engine

Contact Info

Product

Resources

About