Experimental Investigation of Possibilities to Improve Filtration Efficiency of Tangential Inlet Return Cyclones by Modification of Their Design

Abstract

It has been shown that tangential inlet return cyclones are commonly used for inlet air filtration of off-road vehicle engines. The wear of the engine elements, and thus their durability, is determined by the efficiency and accuracy of the inlet air filtration. It has been shown that the possibilities of increasing the separation efficiency or decreasing the pressure drop of a cyclone by changing the main dimensions of the cyclone are limited, because any arbitrary change in one of the dimensions of an already operating cyclone may cause the opposite effect. A literature analysis of the possibility of increasing the filtration efficiency of cyclones by modifying the design of selected cyclone components was conducted. In this paper, three modifications of the cyclone design with a tangential inlet of the inlet air filter of a military tracked vehicle were proposed and performed. The symmetrical inlet of the cyclone was replaced with an asymmetrical inlet. The cylindrical outlet tube was replaced with a conical tube, and the edges of the inlet opening were given an additional streamlined shape. The modification process was carried out on three specimens of the reversible cyclone with a tangential inlet. After each modification, an experimental evaluation of the modifications was carried out. The influence of the modifications on the cyclone’s efficiency characteristics and pressure drop was examined. Subsequent modifications of the cyclone were performed on the same specimen without removing the previous modifications. Tests were performed in the air flow range QG = 5–30 m3/h. Polydisperse “fine” test dust with grain size dpmax = 80 µm was used for testing. The dust concentration at the cyclone inlet was set at 1 g/m2. The performed modifications caused a slight (about 1%) increase in separation efficiency in the range of small (up to QG = 22 m3/h) flux values and about 30% decrease in pressure drop in the whole range of the QG flux, which positively influences the increase in engine filling and its power. There was a noticeable increase in filtration accuracy in the range of low and high values of QG flux, which results in a decrease in the wear of engine components, especially the piston-piston ring-cylinder (P-PR-C) association, and an increase in their durability.

Exploring Hydrogen-Enriched Fuels and the Promise of HCNG in Industrial Dual-Fuel Engines

“…The adiabatic coefficient directly affects the theoretical efficiency of an ICE [262]-both that of a SI engine [263,264] (theoretical efficiency for the Otto cycle) and that of a CI engine (Sabathe cycle) [265,266]. The effect of the fuel fed to the engine on the value of the adiabatic exponent relevant to the compression process will only be significant if the fuel is supplied to the engine indirectly [267], i.e., it begins to form a fuel-air mixture with the air before compression begins in the engine [268,269]. Indirect fuel injection allows for a good air-fuel mixture and allows changing the kappa value before the compression stroke.…”

CFD Simulation of an Industrial Dust Cyclone Separator: A Comparison with Empirical Models: The Influence of the Inlet Velocity and the Particle Size on Performance Factors in Situation of High Concentration of Particles

“…However, the common cyclone shows a low efciency for fne particles [13]. Many attempts have been conducted to improve the separation performance of cyclone separators by optimizing the structure dimension, such as vortex length [14,15], vortex fnder shape and diameter [16][17][18], inlet type, including single, double inlet and more than two inlets [19][20][21], tangential, and spiral inlet [20], inlet dimension [22], diferent inlet section angles in relation to the cyclone body [23][24][25], symmetrical inlet and a volute scroll outlet [26], cone tip diameter [27,28], cyclone height [29], conical length [18,30,31], diameter and length of vortex fnder [32,33] and hopper length [9]. Tere are also various kinds of cyclone separators developed to improve the separation efciency, such as Lee type [34], semispherical cyclone [35], dynamic cyclone [36], square cyclone [37], CFC cyclone [38], and the new generation of cyclone separators presented as multichannel cyclone separators [39][40][41][42][43].…”

Simulation Study on the Corrugated Plate Gas–Liquid Separator with the Assistance of the Drainage Hook

“…A metal screen type mist eliminator is suitable for the diameter range of 0.1–10 μm . Cyclone separators have a separation accuracy of 15–30 μm and are widely used in petrochemical, vehicle, and helicopter internal combustion engine air intakes. − A corrugated plate gas–liquid separator has the advantages of a compact structure, a high separation efficiency, and a small pressure drop loss. It is widely used in nuclear power plants, flue gas desulfurization, and the chemical industry .…”