Abstract
In axial ventilation fans, the generation of a uniform flow velocity is desirable for better efficiency. To that end, different fan blade types have been developed to achieve better flow uniformity. This article aimed to characterize the flow distribution and its uniformity in four blade designs, namely constant chord, tapered blade, skewed blade, and tapered skewed blade, using Computational Fluid Dynamics (CFD). The study employs an iterative study where key study decisions are made as the study progresses. The study began with the selection of a blade profile for the study. A comparative study between the NACA seven-digit and four-digit series was conducted and for its higher flow throughput, the four-digit airfoil profile was selected. Next, with 30 and 40° Angle of Attack (AoA), the constant chord blade flow pattern is characterized. At 40° AoA flow disturbance and high-velocity spots were observed establishing the problem statement. Following that, three optimization strategies (tapering, skewing, and taper skewing) were applied in the design, and the flow pattern of each design was studied. Using a dispersion study a flow uniformity comparison between the models conducted. The property trade-off between three key performance indicators: efficiency, flow rate, and flow uniformity studied. The result shows an axial fan having a higher efficiency doesn't necessarily mean it has higher throughput whereas lower flow dispersion relates to the system's higher efficiency. Therefore, it can be concluded that seeking higher efficiency and flow uniformity in the design and development of axial fans comes with system throughput trade-off.
Highlights
The mining industry highly benefits from the use of mechanical ventilation
The current study aims to inform on flow characteristics of four-blade types which are constant chord, tapered blade, skewed blade, and tapered skewed blade using Computational Fluid Dynamics (CFD)
The first section includes the selection of airfoil profiles that will be used for blade geometry design while flow distribution in constant chord blade type is characterized
Summary
The ventilation system aims to serve a critical role in underground mining operations through the dilution and removal of gas and dust, heat extraction, and oxygen supply for the safety of production and staff The system has such crucial significance; it is expected to be operational 24 hours a day. The consideration of fans as a primary component of the system is challenged by Papar et al [4], where they recommend system-based approach instead of component-based efficiency improvement Such arguments shape the research focus in the field where most studies conducted in mine ventilation look at energy efficiency from the system integration level. With the rising use of more advanced control systems such as ventilation on demand, nonlinear system control, and novel intermittent approaches, the use of damper as the only flow regulator is expected to decline
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