Author
Muhammad Mahmood Aslam Bhutta
Bio: Muhammad Mahmood Aslam Bhutta is an academic researcher from University of Engineering and Technology, Lahore. The author has contributed to research in topics: Weibull distribution & Wind power. The author has an hindex of 6, co-authored 13 publications receiving 729 citations.
Papers
More filters
TL;DR: In this article, the authors reviewed various configurations of VAWT along with their merits and demerits and found that coefficient of power for various configurations is different and can be optimized with reference to Tip Speed Ratio.
Abstract: Increased concern for environment has led to the search for more environment friendly sources of energy. Wind energy can be a viable option in this regard. Vertical axis wind turbines offer promising solution for areas away from the integrated grid systems. However, they have certain drawbacks associated with different configurations. This paper reviews various configurations of VAWT along with their merits and demerits. Moreover, design techniques employed for VAWT design have also been reviewed along with their results. It was learned that coefficient of power (CP) for various configurations is different and can be optimized with reference to Tip Speed Ratio. Latest emerging design techniques can be helpful in this optimization. Furthermore, flow field around the blade can also be investigated with the help of these design techniques for safe operation.
413 citations
TL;DR: In this paper, a literature review focuses on the applications of Computational Fluid Dynamics (CFD) in the field of heat exchangers, and the quality of the solutions obtained from these simulations are largely within the acceptable range proving that CFD is an effective tool for predicting the behavior and performance of a wide variety of heat- exchangers.
388 citations
TL;DR: In this article, a carbon fiber-reinforced polymer composites is used to ensure hole quality aspects such as delamination, roughness, roundness, etc while maintaining an a
Abstract: Drilling into carbon fiber-reinforced polymer composites presents a stiff challenge in terms of ensuring hole quality aspects such as delamination, roughness, roundness, etc while maintaining an a
25 citations
TL;DR: In this article, the effect of HHO gas on lubrication oil for longer periods of engine operation has not yet been studied. But, the authors focus on investigation of the impact of gasoline, CNG, and CNG-HHO blend on L2 degradation along with engine performance and emissions in SI engine.
Abstract: Hydroxy gas (HHO) is one of the potential alternative fuels for spark ignition (SI) engine, notably due to simultaneous increase in engine performance and reduction in exhaust emissions. However, impact of HHO gas on lubrication oil for longer periods of engine operation has not yet been studied. Current study focuses on investigation of the effect of gasoline, CNG and CNG-HHO blend on lubrication oil deterioration along with engine performance and emissions in SI engine. HHO unit produces HHO gas at 4.72 L/min by using 6 g/L of KOH in the aqueous solution. CNG was supplied to the test engine at a pressure of 0.11 MPa using an electronically controlled solenoid valve. Engine tests were carried out at different speeds at 80% open throttle condition and various performance parameters such as brake power (BP), brake specific fuel consumption (BSFC), brake thermal efficiency (BTE), exhaust gas temperature and exhaust emissions (HC, CO2, CO and NOx) were investigated. In addition, various lubrication oil samples were extracted over 120 h of engine running while topping for drain out volume and samples were analyzed as per ASTM standards. CNG-HHO blend exhibited better performance i.e. 15.4% increase in average BP in comparison to CNG, however, 15.1% decrease was observed when compared to gasoline. CNG-HHO outperformed gasoline and CNG in the case of HC, CO2, CO and brake specific fuel consumption (31.1% decrease in comparison to gasoline). On the other hand, CNG-HHO produced higher average NOx (12.9%) when compared to CNG only. Furthermore, lubrication oil condition (kinematic viscosity, water contents, flash point and total base number (TBN)), wear debris (Iron (Fe), Aluminum (Al), Copper (Cu), Chromium (Cr)) and additives depletion (Zinc (Zn), Calcium (Ca)) presented a significant degradation in the case of CNG-HHO blend as compared to gasoline and CNG. Lubrication oil analyses illustrated 19.6%, 12.8% and 14.2% decrease in average viscosity, flash point and TBN for CNG-HHO blend respectively. However, average water contents, Fe, Al and Cu mass concentration appeared 2.7%, 25×10−6, 19×10−6, and 22×10−6 in lubrication oil for CNG-HHO respectively.
21 citations
TL;DR: In this paper, a comparison of different continuous probability distributions for wind data is presented, showing that no single distribution can be declared accurate for all locations and that a comparison can be made between different distributions for different locations.
Abstract: Continuous probability distributions have long been used to model the wind data No single distribution can be declared accurate for all locations Therefore, a comparison of different distribution
21 citations
Cited by
More filters
TL;DR: In this paper, the performance, blade design, control and manufacturing of horizontal axis and vertical axis wind turbines are reviewed based on experimental and numerical studies and lessons learnt from various studies/countries on actual installation of small wind turbines were presented.
Abstract: Meeting future world energy needs while addressing climatic changes has led to greater strain on conventional power sources. One of the viable sustainable energy sources is wind. But the installation large scale wind farms has a potential impact on the climatic conditions, hence a decentralized small scale wind turbines is a sustainable option. This paper presents review of on different types of small scale wind turbines i.e., horizontal axis and vertical axis wind turbines. The performance, blade design, control and manufacturing of horizontal axis wind turbines were reviewed. Vertical axis wind turbines were categorized based on experimental and numerical studies. Also, the positioning of wind turbines and aero-acoustic aspects were presented. Additionally, lessons learnt from various studies/countries on actual installation of small wind turbines were presented.
383 citations
TL;DR: In this article, structural vibrations caused by a flowing fluid were investigated and it was shown that whenever a structure is exposed to a flowing liquid, it will vibrate and vibrate strongly.
Abstract: Structural vibrations caused by a flowing fluid. Whenever a structure is exposed to a flowing fluid,…
279 citations
TL;DR: In this article, the authors investigated the variations in loads and moments on the turbine as well as the experienced angle of attack, shed vorticity and boundary layer events (leading edge and trailing edge separation, laminar-to-turbulent transition) as a function of pitch angle.
262 citations
TL;DR: In this paper, the authors reviewed the applications of ANN for thermal analysis of heat exchangers and highlighted the limitations of ANN in this field and its further research needs in the field.
232 citations
TL;DR: The voltage of the microgrid is controlled by using different controllers and their results are investigated, and the performance of controllers is investigated using MATLAB/Simulink SimPowerSystems.
Abstract: This paper describes the usefulness of renewable energy throughout the world to generate power. Renewable energy adds a remarkable scope in power system. Renewable energy sources act as the prime mover of a microgrid. The Microgrid is a small network of power system with distributed generation (DG) units connected in parallel. The integration challenges of renewable energy sources and the control of microgrid are described in this paper. The varied nature of DG system produces voltage and frequency deviation. The unknown nature of the load produces un-modeled dynamics. This un-modeled dynamic introduces measurable effects on the performance of the microgrid. This paper investigates the performance of the microgrid against different scenarios. The voltage of the microgrid is controlled by using different controllers and their results are also investigated. The performance of controllers is investigated using MATLAB/Simulink SimPowerSystems.
220 citations