The effects of dust extraction on multi-cyclone and non-woven fabric panel filter performance in the air filters used in special vehicles

Abstract

Article citation info: (*) Tekst artykułu w polskiej wersji językowej dostępny w elektronicznym wydaniu kwartalnika na stronie www.ein.org.pl ForewordProviding a dust-free inlet air to the internal combustion engines of motor vehicles and machines, and thus reducing wear and improving component life, always was and still is a major operational and design issue, in particular for vehicles operating in heavy-duty terrain and high dust concentration conditions (about 1 g/m 3 ) [2, 10, 12, 18,20, 30]. It generally applies to special vehicles, including military vehicles with high-power diesel engines with a maximum air demand Q Sil over 1 kg/s, e.g.: Q Sil = 1.21 kg/s, (3,400 m 3 /h) for T-72 tank engine and Q Sil = 2.15 kg/s (6,000 m 3 /h) for Leopard 2 tank engine. At dust concentration level s = 1 g/m 3 , specific to the vehicles used on testing grounds, the engines of those tanks draw in a stream of dust at 0.94 g/s and 1.67 g/s, respectively. Two-stage air filters in a multi-cyclone -porous panel filter configuration (usually made of paper filter element or non-woven fabric filter element) are used to remove the dust mass, with particle size <100 µm [2,4, 10], from the inlet air stream. The concept of using two-stage filters consists in initial separation of large dust particles in an inertial filter (multi-cyclone) and leaving small dust particles (d z < 15÷30 µm) in the air stream and separating small air particles (above d z = 2÷5 µm) in the panel air filter - Fig. 1.The time in which the air filtration system reaches permissible air filter flow resistance ∆p fdop (5÷8 kPa) is significantly longer compared DZIUBAK T. The effects of dust extraction on multi-cyclone and non-woven fabric panel filter performance in the air filters used in special vehicles. Eksploatacja i Niezawodnosc -Maintenance and Reliability 2016; 18 (3): 348-357, http://dx.doi.org/10.17531/ein.2016.3.5. Tadeusz DZIUBAKThe effecTs of dusT exTracTion on mulTi-cyclone and non-woven fabric panel filTer performance in The air filTers used in special vehicles wpływ odsysania pyłu na charakTerysTyki mulTicyklonu i włókninowej przegrody filTracyjnej filTru powieTrza pojazdu specjalnego*

Malfunctions of Aviation Hydraulic Pumps

“…Pompy hydrauliczne używane w lotnictwie to zwykle pompy wyporowe, tłoczkowe o stałej lub zmiennej wydajności, osiowe lub promieniowe W procesie eksploatacji lotnicze pompy hydrauliczne poddawane są oddziaływaniom szerokiego widma czynników wpływających w różny sposób na ich stan techniczny [3,9,13]. Wpływ czynników eksploatacyjnych na stan techniczny pompy hydraulicznej przejawia się w postaci odchyleń od nominału jej parametrów, wskutek zużycia jej par precyzyjnych lub starzenia uszczelnień elastomerowych [1,2,7]. Mechanizm wewnętrzny i prędkość przebiegu procesu powstawania uszkodzeń w pompie hydraulicznej zależą od struktury i właściwości materiału, naprężeń wywołanych przez obciążenia, temperatury pracy itp.…”

“…Hydraulic pumps used in aviation are usually positive displacement, piston pumps with constant or variable displacement, axial or radial In the process of operation, airline hydraulic pumps are subjected to the effects of a wide spectrum of factors influencing their technical condition in various ways [3,9,13]. The impact of operating factors on the technical condition of a hydraulic pump manifests itself in the form of deviations from the nominal of its parameters, as a result of wear of its precision pairs or aging of elastomer seals [1,2,7]. The process of the occurrence of damage in a hydraulic pump usually represents a certain process running over time, the internal mechanism and speed of which depend on the structure and properties of the material, stresses caused by loads, operating temperature, etc.…”

Experimental Analysis of the Influence of the Application of TiN, TiAlN, CrN and DLC1 Coatings on the Friction Losses in an Aviation Internal Combustion Engine Intended for the Propulsion of Ultralight Aircraft

“…Moreover, in [26][27][28], an attempt was made to verify the degree of dust in the air and filtration to the degree of wear of the main piston mechanisms of internal combustion engines; this is very important for the operation of aircraft engines and their operational safety, and an important aspect of the interaction between the working surface life of the piston rings and the cylinder bore in internal combustion piston engines in aircrafts. Modeling of the oil film in internal combustion piston engines is described in [29,30].…”

Experimental Studies of Dust Suction Irregularity from Multi-Cyclone Dust Collector of Two-Stage Air Filter

“…It can be noticed that in spite of the use of the dust suction, dust accumulation occurs and the outlets of the cyclone dust suction slots are blocked. More information on this subject is provided by the author in [63].…”

“…It can be noticed that in spite of the use of the dust suction, dust accumulation occurs and the outlets of the cyclone dust suction slots are blocked. More information on this subject is provided by the author in [63]. In those cyclones where the suction rate m 0 assumes a low value, the resulting increase in the efficiency is insignificant.…”