Influence of pleat geometry on filter cleaning in PTFE/glass composite filter

Park, Byung Hyun; Lee, Myong‐Hwa; Jo, Young Min; Kim, Sang Bum

doi:10.1080/10962247.2012.696530

Cited by 47 publications

(12 citation statements)

References 8 publications

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“…Reducing the pressure drop through the air filter element, and thus improving engine performance, was the subject of macroscopic optimization and geometric parameter studies of the fibrous pleated filter element. According to the conducted studies, a pleated filter bed with fixed geometric parameters (pleat height and width, pleat spacing) is characterized by the optimal number of pleats at which the minimum pressure drop was recorded [ 45 , 46 , 47 , 48 , 49 , 50 , 51 , 52 , 53 , 54 , 55 , 56 , 57 , 58 , 59 , 60 , 61 , 62 ].…”

Section: Research and Optimization Of Pleated Deposits In The Literaturementioning

confidence: 99%

“…Park et al [ 48 ] conducted research and optimization toward minimizing the flow resistance of several samples of pleated filter beds for varying the angle between pleats, different pleat lengths and the number of pleats. A dimensionless pleat factor was defined, which is the quotient of pleat height and pleat pitch (distance between the tops of successive pleats).…”

Section: Research and Optimization Of Pleated Deposits In The Literaturementioning

confidence: 99%

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Experimental Studies of PowerCore Filters and Pleated Filter Baffles

Dziubak

2022

Materials

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The material most commonly used to filter and clean the intake air of vehicle internal combustion engines is pleated filter paper, which in most cases is shaped in the form of a cylinder or panel. The production technology has a low cost and is not complicated. In addition to high separation efficiency and filtration performance, pleated filter media are required to have low initial pressure drop, which depends on the geometry of the bed. Much research has been conducted in this area. Dust accumulated in the filter bed causes an increase in pressure drop, which is the cause of deformation and sticking of pleats. The lack of stability of the pleats, the need to strengthen them, and the need to obtain small sizes while achieving high efficiency and accuracy of filtration of engine intake air was the reason for the development of a different design and a new technology for making filter cartridges called PowerCore. The distinctive feature of these filters is axial flow in one direction of the air stream, which avoids turbulence and thus minimizes pressure drop. This paper presents a comparative analysis of a standard PowerCore and PowerCore G2 filter bed and two cylindrical filters with a pleated filter bed made of cellulose and polyester. The conditions and methodology of experimental testing of filters with test dust are presented. During the tests, the characteristics of separation efficiency and filtration performance, as well as pressure drop as a function of the mass of dust retained on the filter of two PowerCore filters and two cylindrical filters were performed. Three specimens of test filters with the same filtration area were made from each sample of filter bed. The results showed that in each test of the filter bed, there is an initial filtration period characterized by low (96–98%) initial separation efficiency and the presence of large (dpmax) dust grains. As the dust loading of the bed increases, the separation efficiency and filtration performance obtain higher and higher values. The initial period of filtration ends when the conventional value (99.9%) of separation efficiency is reached. The duration of this period depends on the type of filter bed and for the PowerCore G2 filter ends for a dust loading of km = 33.1 g/m2, and for the cellulose filter for km = 117.3 g/m2. During the initial period, the air behind the PowerCore G2 filter contains grains with sizes in the range of dpmax = 9–16 µm. Behind the cellulose filter, dust grains are much larger, dpmax = 17–35 µm. The total operating time of the PowerCore G2 filter, limited by the achievement of the permittivity resistance Δpwdop = 3 kPa, is twice that of the other filter compositions tested.

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Section: Research and Optimization Of Pleated Deposits In The Literaturementioning

confidence: 99%

Section: Research and Optimization Of Pleated Deposits In The Literaturementioning

confidence: 99%

Experimental Studies of PowerCore Filters and Pleated Filter Baffles

Dziubak

2022

Materials

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“…that for a given pleat height and constant air stream, there is such a width between the pleats for which the pressure drop reaches the lowest value. Park et al [38] conducted research and various samples optimization of pleated filter elements by changing the angle between the pleat sides, the pleat length and the number of pleats. Highest separation efficiency was obtained when the dimensionless pleat coefficient defined as the quotient of pleat height (vertical distance from the top of the pleat to the base) and the pleat pitch (the distance between pleat apexes) was 1.48.…”

Section: Filter Service Aftermentioning

confidence: 99%

Problems of selecting filter partition in passenger car engine intake air filters

Dziubak¹,

Bąkała²

2021

Combustion Engines

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The aim of this study was to verify the criteria for selecting pleated filter partitions used in passenger car engine filters. The paper presents the problem of optimizing pleated air filters in the dir ection of minimizing pressure drop, which is the source of engine energy losses. Two criteria for selection of a paper filter partition for specific operating conditions of the filter and the engine are presented: criterion of permissible separation speed and criterion of permissible pressure drop. The actual filtration area of 44 paper pleated filter elements used in passenger cars and the air stream flowing through the filter were determined, which made it possible to calculate separation speed. In 62% of the analyzed filter inserts, the calculated separation speeds are within the speed range recommended by the constructors, Fmax = 0,06-0,12 m/s. Exceeding permissible separation speed Fmax = 0,12 m/s was found mainly in supercharged engines. Negative effects of engine operation with an air filter with too small separation area are presented, in the form of increased pressure drop and energy loss of the engine as well as shorter car mileage to reach permissible pressure drop.

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“…Lo et al (3,5) revealed that the efficiency of cleaning is also dependent on the pleat geometry (height to pitch ratio), distance from the pulse-jet nozzle, the medium surface finish, medium permeability and the chosen cleaning schedule (at regular time intervals or 'on demand'). Such a multitude of parameters renders the academic field more conducive to case-specific optimisation studies, such as that offered by Park et al (6) , in which the optimum pleat height to pitch ratio was found to be 1 . 48, above which filter cleaning became difficult.…”

Section: Introductionmentioning

confidence: 99%

Self-cleaning barrier filter for rotorcraft engines

Bojdo

Filippone

2014

Aeronaut. j. (1968)

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A parameter-based study of a novel self-cleaning barrier filter concept for rotorcraft engines is presented. Existing engine inlet barrier filters for rotorcraft achieve a high separation efficiency (up to 99% for a dust resembling a coarse test dust) at the expense of a pressure drop that increases over time. Other engine protection devices with invariant pressure loss signals cannot offer the same level of efficiency. Furthermore, inlet barrier filters are absent on rotorcraft with larger mass flow demands, due to larger filtration area required. This work proposes a solution that addresses each of these limitations, and establishes the parametric framework upon which such a design could be realised. The drum-shaped self-cleaning barrier filter is affixed to the engine inlet and spins about its longitudinal axis, such that each of its fibrous filter pleats can be cleaned once per cycle. An initial increase of pressure loss gives way to a period of sustained invariance. The key parameters are the internal particle capacity of the chosen filter medium and the speed of rotation. Other design parameters can be optimised to yield minimum pressure drop for given set of flow conditions.

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Influence of pleat geometry on filter cleaning in PTFE/glass composite filter

Cited by 47 publications

References 8 publications

Experimental Studies of PowerCore Filters and Pleated Filter Baffles

Experimental Studies of PowerCore Filters and Pleated Filter Baffles

Problems of selecting filter partition in passenger car engine intake air filters

Self-cleaning barrier filter for rotorcraft engines

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