Impellers with splitter BLADEs are used for pumps and compressors in the design of turbomachines. Design parameters such as the number of BLADEs, BLADE discharge ANGLE and impeller discharge diameter impact affect pump performance and energy consumption. In this study, the effect of the number of BLADEs (z=5, 6, and 7), BLADE discharge ANGLEs (β 2b=25 , and β 2b=35 ) and splitter BLADE lengths (40, 55, 70, and 85% of the main BLADE length) on Deep Well Pump (DWP) performance has been studied experimentally. In the experiments, pump casing, BLADE inlet ANGLE, BLADE thickness, BLADE width and impeller inlet and discharge diameters have been kept fixed while other parameters such as the number of BLADEs, BLADE discharge ANGLEs and splitter BLADE lengths have been allowed to vary. As a result of the experimental study, the highest efficiency of all the impellers for best efficiency point (b. e. p) has been obtained on the impeller with the number of BLADEs z=6, BLADE discharge ANGLE  2b=25 and 85% splitter BLADE addition compared to impellers without splitter BLADEs.

The BLADE inclination ANGLE of soybean milk machine is a key geometric parameter for efficient crushing. For the purpose of obtaining optimal design, the gas-liquid two-phase flow field inside a soybean milk machine is simulated. The gas holdup from simulation is in agreement with the experiment. The simulation result shows that the lower BLADE A has a great influence on the internal flow field of soybean milk machine, while the upper BLADE B has a small influence on the flow field. As the ANGLE l αA l increases, the peak value of radial velocity decreases and moves to the interior of the cavity, so does the total pressure. When αA changes from-24° to-26°, the velocity vector at the bottom of the cavity changes from the connected state to the separated state, and the pressure difference between the up and the bottom surface of BLADE A becomes large. When αA = 24°, the flow field has the strongest turbulent kinetic energy and dissipation. When αB =28°, the pressure difference reaches the maximum. In summary, the best inclination ANGLEs are αAopt =-24° ∼-26° and αBopt =28°, respectively.

Hydrokinetic turbine performance depends on different parameters such as BLADE geometrical parameters (i.e. chord length, BLADE pitch ANGLE, hydrofoil shape, BLADE yaw ANGLE etc.) Kinematic parameters (i.e. water speed, rotational speed etc.) and other important parameters include tip speed ratio (TSR) and the location of turbine in the channel or river bed. In this project Computational fluid dynamics (CFD) and commercial software ANSYS Fluent 16 are used to simulate hydrokinetic turbine.In numerical simulation multiple reference frame (MRF) model and the shear -stress transport k-w SST turbulence model are used. The grid independency is studied to ensure of numerical results. Also, the results are validated with experimental data. At first, to investigate the effect of BLADE pitch ANGLE and chord length on power coefficient, three different chord lengths were considered and BLADE pitch ANGLE over a range of BLADE pitch ANGLEs (0o to 16o) with TSR (2.17 to 6.22) are studied. The results show that maximum power coefficient was found at 10o BLADE pitch ANGLE with 1.676 cm chord length. Based on the results, stall delay depends on BLADE pitch ANGLE and chord length.

The effects of BLADE discharge ANGLE on the performance of a standard industrial centrifugal oil pump of type 65Y60 were investigated experimentally as the pump handled both water and viscous oil. A one-dimensional hydraulic loss model was established to identify such effects mathematically. The effects have been estimated analytically by using the model at various viscosities. The results showed that the BLADE discharge ANGLE has significant but equal influence on the head, shaft power and efficiency of the centrifugal oil pump at various viscosity conditions. For any viscosity, the total hydraulic loss in the impeller and volute rises with increasing BLADE exit ANGLE. The diffusion loss in and behind the impellers as well as the friction loss in the volute are noticed in the pump, especially for highly viscous liquids. The hydraulic loss in the impellers is about 0.8-0.6 times the loss in the volute. In order to improve the pump performance, the hydraulic loss in the volute must be kept as small as possible.

The Darrieus lift-based VAWT has been studied by many scientists due to its simplicity of design and the wind direction independency. Due to increasing ANGLE of attack and dynamic stall at low tip speed ratios, these wind turbines have the inherent problem of self-starting inability and produce less power's compared to that of horizontal axis wind turbines. In this study, the effects of variable BLADE pitch ANGLE mechanism on decreasing dynamic stall have been investigated. Finally, a pitching system (variable pitch Darrieus-type wind turbine) has been proposed, which can reduce both the BLADEs, oscillating motion and the magnitude of the ANGLE of attack in one revolution, compared to that of conventional VAWT. In this study, unsteady two-dimensional simulation is conducted, using CFD with moving mesh the rotating rotor. Simulation of different preset pitch ANGLEs of ±3° and ±6°, ±9° and ±12°, it is concluded that adjustment of pitch ANGLE about -3°, causes a delay in flow separation and control dynamic stall. It was also observed that a variable-pitch BLADE turbine can suppress flow separation on its BLADEs at low tip speed ratios. This leads to delay or elimination of dynamic stall and results in a higher efficiency during the range of turbine operation compared to that of fixed-pitch BLADE Darrieus turbines.

Introduction: Tillage is one of the most important field operations to improve soil structure and physical conditions and provide the proper plant site. Conservation tillage is one of the methods of tillage that reduces tillage costs. The BLADE is one of the most important consumed components of tillage tools in the conservation tillage, which is very important for how it is adjusted and its effect on the quality of tillage and energy required of tillage tools. According to the research conducted on the importance of optimizing tillage implements, the aim of this study was oriented to determine the optimum rake ANGLE of a narrow-modified winged and non-winged BLADE in the field soil. Materials and Methods: The tests were conducted in the 22nd part of farms in Agriculture School (Bajgah zone) of Shiraz University. Three levels of BLADE rake ANGLEs (20, 25, and 30 degrees), two levels of tillage depth (15 and 20 cm), and two levels of forward speed (2 and 3 km h-1) were the treatments of this study. Draft, fuel consumption, slippage, soil disturbance area, soil upheaving area, and specific draft were the measured parameters and they were measured for each combination of the treatments. The RNAM test code was then used to measure the draft force. In order to measure fuel consumption, two flow meters were used in the round way as a closed-loop. The encoder and the fifth wheel were also employed to measure the slippage. The profilometer and laser meter were applied to measure the soil upheaving and disturbance areas. The split-split plot on randomized complete block design was used to do the field experiments in three replication and the data analysis was performed by SAS software (9. 4 edition). Multivariate linear regression was used to determine the optimum values of the mentioned parameters. For this purpose, the lowest value of draft, fuel consumption, specific draft, tractor driver wheel slip, and the highest soil disturbance and upheaving areas was considered. Result and Discusion: The results showed that the magnitude of draft increased with rake ANGLE, therefore, the minimum draft was obtained in the rake ANGLE of 20° . As the BLADE rake ANGLE increased, the amount of soil disturbance area was increased and the maximum soil disturbance was obtained in the rake ANGLE of 30° . The mean slip values of the tractor driver wheels when using non-winged BLADE were not significant for three levels of BLADE rake ANGLEs and it was significant for two velocity levels. With increasing in rake ANGLE from 20 to 25° , the mean values of specific draft were increased, but with changeing the rake ANGLE from 25 to 30° , there was not significant difference between specific draft values. The difference between the magnitude of tractor driver wheels slip for three levels of rake ANGLE was not significant. Increasing the rake ANGLE had a significant effect on tractor fuel consomption, such that it increased by increasing the rake ANGLE values. Conclusions: The optimum rake ANGLE for the non-winged BLADE mode was 20° with R2 of 0. 73 and for the winged BLADE mode was 30° with R2 of 0. 90. The optimum depth for the non-winged BLADE was 19. 98 cm with R2 of 0. 99 and for the winged BLADE was 20 cm with R2 of 0. 97. Also, the optimum forward speed values for the non-winged BLADE was 2. 21 km h-1 with R2 of 0. 43 and for the winged BLADE was 2. 03 km h-1 with R2 of 0. 84.

Renewable energy is an inevitable choice to meet the demands of energy resource. In the 21st century, one of the serious problems facings us is the energy resources that restrict the social progress and sustainable development. Environmental pollution and fossil energy resources shortage force people to explore and use new energy resources. The aim of this paper is to study the effect of BLADE installation ANGLE on power coefficient of a five-BLADE resistance type vertical axis wind turbine using CFD simulations. The computation is conducted for the turbine with the BLADE diameter of 0.76–0.86 m and the turbine radius R=2 m. The results show that the maximum value of power efficiency of 28.48% can be obtained when the installation ANGLE is 19o for the five-BLADE resistance type vertical axis wind turbine with the BLADE diameter of 0.78 m and the turbine radius R=2 m.

Investigation of the effects BLADE pitch ANGLE on noise emission from a horizontal axis wind turbine is the goal of this paper. To understand the flow around BLADE wind turbine, and to reduce noise emission in order to respect noise regulation, especially a residential area, three different pitch ANGLEs 0° , 3° , and 6° are tested, using computational aerodynamic and aero acoustic methods. Three dimensional flow simulations are carried out with two unsteady CFD simulations URANS, DES used to calculate the near-field flow around a HAWT of NREL Phase VI small scale. The far field noise is predicted from the simulated sources by the Ffowcs William and Hawkings analogy, and compared and validated with available test data for a small-scaled model of the NREL Phase VI. The comparison demonstrates a generally good agreement between DES predicted and measured noise levels. It can be seen that the noise emission increases by decreasing pitch ANGLE. Moreover, the pitch ANGLE control has a significant effect on the noise emission especially in the intermediate frequency range. We show that it is possible to reduce the noise level by control pitch ANGLE without losing too much the power.