scholarly journals Numerical investigation of the turbulent flow generated with a radial Turbine using a converging hollow blade

2018 ◽  
Vol 20 (4) ◽  
pp. 129-137 ◽  
Author(s):  
Mousaab Beloudane ◽  
Mohamed Bouzit ◽  
Houari Ameur
Keyword(s):  
Computer Code ◽  
Stirred Tank ◽  
Blade Design ◽  
Impeller Blade ◽  
Validation Test ◽  
Radial Turbine ◽  
Ansys Cfx ◽  
Hollow Blade ◽  
Blade Shape

Abstract The aim of this study is to investigate the effect of the blade shape on the characteristic of the flow patterns in a stirred tank. A new impeller blade design has been proposed. It is characterized by a converging hollow. The investigations of the flow structure generated in the vessel are made by using the computer code ANSYS CFX (version 16.0). The analysis has shown that the converging hollow blade yields highly radial flows which gave an increase in the radial velocity by 35% with less power consumption than the flat blade. Also, the effectiveness of the energy dissipation and the quality of mixing has been obviously noted. A validation test of our predicted results with other literature data was done, and a satisfactory agreement has been found.

Pure Design Method for Aerofoils in Cascade

1969 ◽  
Vol 11 (5) ◽  
pp. 454-467 ◽  
Author(s):  
K. Murugesan ◽  
J. W. Railly
Keyword(s):  
Exact Solution ◽  
Velocity Distribution ◽  
Design Problem ◽  
Design Method ◽  
Tangential Velocity ◽  
Surface Velocity ◽  
Normal Velocity ◽  
Blade Design ◽  
Blade Shape

An extension of Martensen's method is described which permits an exact solution of the inverse or blade design problem. An equation is derived for the normal velocity distributed about a given contour when a given tangential velocity is imposed about the contour and from this normal velocity an initial arbitrarily chosen blade shape may be successively modified until a blade is found having a desired surface velocity distribution. Five examples of the method are given.

scholarly journals RANCANG BANGUN DAN UJI ALAT PROSES PENINGKATAN MINYAK CENGKEH PADA KLASTER MINYAK ATSIRI KABUPATEN BATANG

2012 ◽  
Vol 10 (2) ◽  
pp. 64 ◽  
Author(s):  
W Widayat ◽  
Bambang Cahyono ◽  
N Ngadiwiyana
Keyword(s):  
Essential Oils ◽  
Adsorption Process ◽  
Operating Time ◽  
Stirred Tank ◽  
First Year ◽  
Clove Oil ◽  
Product Analysis ◽  
Central Java ◽  
Low Levels

ABSTRAK Minyak cengkeh merupakan salah satu produk dari minyak atsiri yang dihasilkan oleh Kluster Minyak Atsiri di Kabupaten Batang. Permasalahan yang dihadapi saat ini adalah kadar eugenol yang rendah serta warna yang belum bisa memenuhi standar SII/EOA maupun SNI 06 2387 2006. Penelitian ini bertujuan untuk melakukan peningkatan kualitas minyak cengkeh /eugenol dengan proses adsorpsi. Hasil penelitian menujukkan bahwa: bahan minyak cengkeh belum memenuhi standar SNI 06 2387 2006 khususnya dari warna dan kadar eugenol total. Hal ini dikarenakan dalam proses masih digunakan peralatan dari besi. Minyak cengkeh dapat ditingkatkan kadar eugenol dan perbaikan warna menjadi lebih cerah (kuning) dengan penambahan asam sitrat 0,6-10%. Peralatan dengan pengadukan dapat digunakan dalam proses peningkatan minyak cengkeh. Daya yang terpasang sekitar 1 PK dan kapasitas setiap batch 20-30 kg dengan waktu operasi 60 menit dan temperatur 50oC. Kemampuan UKM di Klaster Minyak Atsiri Kab Batang Jawa Tengah dapat ditingkatkan dengan kegiatan pelatihan dan Expo hasil penelitian. Pada Tahun pertama, UKM telah melakukan kegiatan analisis produk dan perbaikan minyak cengkeh sehingga memenuhi standar SNI 06 2387 2006. Kata Kunci: minyak cengkeh, eugenol, adsorpsi, tangki berpengaduk, persentase Fe terikat ABSTRACT Clove oil is a product of essential oils produced by clusters of Essential Oils in Batang. The problem faced today is that low levels of eugenol and it color doen’t meet with SII / EOA and SNI 06 2387 2006 standard. The purpose in this research for improving the quality of clove oil / eugenol with adsorption process. The results showed that: clove oil doesn’t meet of SNI 06 2387 2006 especially at colors and total eugenol. This is because the process was used equipment from iron. The eugenol and color improving to yellow bright of clove oil by adding citric acid from 0.6 to 10%. Stirring equipment can be used to the process for increasing the quality of clove oil. Installing power of about 1 PK with batch of 20-30 kg capacity with 60 minutes operating time at 50oC. The capability of UKM at clusters of Essential Oil at Batang, Central Java can be improved by training and researching Expo. In the first year, UKM had engaged in product analysis and improvement of clove oil that meets with SNI 2387 06 2006.   Keywords: clove oil, eugenol, adsorption, stirred tank, the percentage of Fe bonded

Hard Clay as Host Medium Thermo-Mechanical Experiments and Model

1985 ◽  
Vol 50 ◽  
Author(s):  
G. Baldi ◽  
M. Borsetto ◽  
T. Hueckel ◽  
A. Peano ◽  
E. Tassoni
Keyword(s):  
Dissipation Rate ◽  
Pore Water Pressure ◽  
Essential Feature ◽  
Water Pressure ◽  
Pressure Rise ◽  
Computer Code ◽  
Host Medium ◽  
Clay Formation ◽  
The Mathematical Model

AbstractClay's impermeability is an essential feature for the quality of a possible repository. However it results in a substantial pore water pressure rise induced by heating whose magnitude and dissipation rate depend on the clay's deformational response to heating. Experiments on thermal strains and effective stress are reported and the mathematical model implemented in a computer code is described. It allows study of a repository performance due to waste heating in both continental and subseabed clay formation.

scholarly journals The influence of flow passage geometry on the performances of a supercritical CO2 centrifugal compressor

2018 ◽  
Vol 22 (Suppl. 2) ◽  
pp. 409-418 ◽  
Author(s):  
Dong-Bo Shi ◽  
Yu-Qi Wang ◽  
Yong-Hui Xie ◽  
Di Zhang
Keyword(s):  
Centrifugal Compressor ◽  
Supercritical Co2 ◽  
Pressure Ratio ◽  
Leading Edge ◽  
Thermal Design ◽  
Original Design ◽  
Impeller Blade ◽  
Flow Passage ◽  
Ansys Cfx ◽  
Design Idea

In this paper, based on the thermodynamic design of the supercritical carbon dioxide (sCO2) centrifugal compressor, the design idea of the flow passage geometries and the method to improve the performance of the sCO2 centrifugal compressor are discussed. With the help of commercial software ANSYS CFX, the influence of the shape of the leading edge and trailing edge is studied, and the elliptical leading edge makes the pressure ratio 10.30% higher and the efficiency 3.95% higher than the square leading edge. By changing the forward-swept angle and backward-swept angle of the leading edge, the effects of aerodynamic swept shape in sCO2 centrifugal compressor are discussed. The effect of the gap between the impeller blade and diffuser blade is discussed, and the 10 mm gap makes the performance best. The pressure ratio is increased by 2.5% compared with the original design, while at the same time the efficiency is slightly improved. In summary, based on thermal design of the sCO2 centrifugal compressor, the effects of different flow geometries are analyzed in detail.

scholarly journals CFD simulation on centrifugal pump impeller with splitter blades

2020 ◽  
Vol 24 (1) ◽  
pp. 3-7 ◽  
Author(s):  
Henrique M. P. Rosa ◽  
Bruno S. Emerick
Keyword(s):  
Centrifugal Pump ◽  
Cfd Simulation ◽  
Computational Simulations ◽  
Pump Impeller ◽  
Impeller Blade ◽  
Flow Rates ◽  
Computational Fluids Dynamics ◽  
Ansys Cfx ◽  
Computational Fluids ◽  
Centrifugal Pump Impeller

ABSTRACT The present paper aims to present the analysis and comparison of results of computational simulations using Computational Fluids Dynamics (CFD) in impellers of centrifugal pump. Three impellers were simulated: 1) original impeller, 2) original impeller with splitter blades at outlet; 3) original impeller with splitter blades at inlet. The splitters occupied 30% of the length of the main blades. They were simulated using the ANSYS-CFX software system in 1500 rpm rotational speed and at different flow rates. The turbulence model assumed was the Shear Stress Transport (SST). The results were used to build impeller blade head curves, besides the presentation of pressure distribution and streamline behaviour inside the impeller. It was verified that the insertion of the splitter blades reduced the impeller blade head, mainly the impeller with outlet splitter, whose reduction was more intense.

Unsteady 3D-Numerical Investigation of the Influence of the Blading Design on the Stator-Rotor Interaction in a 2-Stage Turbine

2005 ◽  
Author(s):  
Dieter E. Bohn ◽  
Jing Ren ◽  
Christian Tu¨mmers ◽  
Michael Sell
Keyword(s):  
Gas Turbines ◽  
Flow Characteristics ◽  
Computer Code ◽  
Experimental Investigations ◽  
Blade Design ◽  
Test Rig ◽  
3D Flow ◽  
Two Stage ◽  
Flow Phenomena ◽  
Flow Through

An important goal in the development of turbine bladings is improving their efficiency to achieve an optimized usage of energy resources. This requires a detailed insight into the complex 3D-flow phenomena in multi-stage turbines. In order to investigate the flow characteristics of modern highly loaded turbine profiles, a test rig with a two-stage axial turbine has been set up at the Institute of Steam and Gas Turbines, Aachen University. The test rig is especially designed to investigate different blading designs. In order to analyze the influence of the blade design on the unsteady blade row interaction, the 3D flow through the two-stage turbine is simulated numerically, using an unsteady Navier-Stokes computer code. The investigations include a comparison of two bladings with different design criteria. The reference blading is a commonly used cylindrical designed blading. This blade design will be compared with a bow-blading, which is designed to minimize the secondary flow phenomena near the endwall in order to achieve a balanced mass flow through nearly the whole passage height. The investigations will focus on the different loss behavior of the two bladings. Unsteady profile pressure distributions and radial efficiencies of the two blade designs will be discussed in detail. The flow conditions are taken from experimental investigations performed at the Institute of Steam and Gas Turbines. On the basis of the experiments a validation of the code will be performed by comparing the numerical results to the corresponding experimental data at the inlet and the outlet of the blading.

Aerodynamic Damping Analysis for Radial Turbine Featuring a Multi-Channel Casing Design

2020 ◽  
Author(s):  
Ahmed Farid Hassan ◽  
Tobias Müller ◽  
Markus Schatz ◽  
Damian M. Vogt
Keyword(s):  
Damping Ratio ◽  
Full Model ◽  
Aerodynamic Damping ◽  
Radial Turbine ◽  
Damping Behavior ◽  
Ansys Cfx ◽  
Partial Admission ◽  
Time Marching ◽  
Opening And Closing ◽  
Spiral Casing

Abstract Radial turbine featuring a Multi-channel Casing (MC) is a new design under investigation for enhancing the turbine controllability. The idea behind this new design is to replace the traditional spiral casing with a MC, which allows controlling the mass flow by means of opening and closing control valves in each channel. The arrangement of the closed and opened channel is called the admission configuration, while the ratio between the counts of the open channels to the total number of channels is called the admission percentage. Among several aspects, when applying different admission configurations, the aerodynamic damping during resonant excitation is considered during the design of the turbine. The present study aims at investigating the effect of different MC admission configurations on the aerodynamic damping as an extension to an aerodynamic forcing study, which already assessed the different forcing patterns associated with these different admission configurations. Due to the asymmetry of the flow in circumferential direction resulting from the different partial admission configurations, the computational model is solved as full 3D time-marching, unsteady flow using ANSYS CFX in a one-way fluid-structure analysis. Two different modeling approaches have been considered in this study to investigate their capability of predicting the damping ratio for different MC admission configurations: a) the conventional isolated rotor approach and b) a full model consisting of the rotor and its casing. The results show that the casing affects the aerodynamic damping behavior, which can only be captured by the full model. Furthermore, the damping ratios for all different admission configurations have been calculated using the full stage model.

A Parametric Study of Radial Turbomachinery Blade Design in Three-Dimensional Subsonic Flow

1990 ◽  
Vol 112 (3) ◽  
pp. 338-345 ◽  
Author(s):  
W. S. Ghaly
Keyword(s):  
Parametric Study ◽  
Subsonic Flow ◽  
Pressure Field ◽  
Design Method ◽  
Three Dimensional ◽  
Rate Of Change ◽  
Blade Design ◽  
Blade Loading ◽  
Pressure Fields ◽  
Blade Shape

An aerodynamic design method is described and used to implement a parametric study of radial turbomachinery blade design in three-dimensional subsonic flow. Given the impeller hub and shroud, the number of blades and their stacking position, the design method gives the detailed blade shape, flow, and pressure fields that would produce a prescribed tangentially averaged swirl schedule. The results from that study show that decreasing the number of blades increases the blade wrap, and that the blade loading is strongly affected by the rate of change of mean swirl along the mean streamlines. The results also show that the blade shape and the pressure field are rather sensitive to the prescribed mean swirl schedule, which suggests that, by carefully tailoring the swirl schedule, one might be able to control the blade shape and the pressure field and hence secondary flow.

Design and Analysis of Radial Turbine for Turbocharger Application

2017 ◽  
Author(s):  
Bharathan Raghavan Desikan ◽  
David John Rajendran ◽  
Sharad Kapil ◽  
Seepana Venkata Ramana Murty ◽  
Deshkulkarni Kishore Prasad
Keyword(s):  
Kinetic Energy ◽  
Internal Combustion Engines ◽  
Low Cost ◽  
Navier Stokes ◽  
Combustion Engines ◽  
Customer Requirements ◽  
Turbine Wheel ◽  
Radial Turbine ◽  
Ansys Cfx ◽  
Radial Turbines

Turbochargers are used in internal combustion engines to increase their volumetric efficiency and power. Turbochargers consist of a centrifugal compressor driven by a radial turbine. Radial turbines convert the excess kinetic energy in the exhaust gases to power. Vane less radial turbine consists of a volute and a turbine wheel. It is preferred because of its low cost, robustness and good off-design performance. In this study, a radial turbine wheel and volute are designed to meet the power and efficiency requirements. A number of trials are carried out, and the design, which gives the necessary performance and meets the customer requirements, is chosen. The design is analyzed using a validated 3D Navier-Stokes (NS) solver, viz. ANSYS-CFX software at both design and off-design conditions and turbine characteristics are generated.

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