ISO 17536-1:2015 道路車両—内燃機関のエアロゾルセパレーター性能試験—パート1：一般 | ページ 5

2.1.1

blowby

aerosol produced from engines and released through a crankcase vent

2.1.2

oil carryover

total amount of liquid oil captured in the downstream wall flow trap

2.1.3

filter element

replaceable part of the crankcase system, consisting of the filter material and carrying frame

2.1.4

crankcase ventilation system

device which separates oil and particles from the engine blowby before venting to either the engine (closed crankcase ventilation, CCV) or the environment (open crankcase ventilation, OCV)

2.1.5

differential pressure

difference in static pressure measured immediately upstream and downstream of the unit under test

2.1.6

pressure loss

measure of the loss of aerodynamic energy caused by an aerosol separator at the observed air flow rate due to different flow velocities at the measuring point.

Note 1 to entry: It is expressed as the differential pressure corrected for any difference in the dynamic head at the measuring points

Note 2 to entry: For further information, see Annex A.

2.1.7

wall flow trap

device to capture oil that is flowing along the walls

Note 1 to entry: The wall flow trap design is drawn in Figure I.2.

2.1.8

absolute filter

filter downstream of the unit under test to retain the contaminant passed by the unit under test

2.1.9

piezometer tube

duct that has a hole or holes drilled in the wall to obtain a pressure reading

Note 1 to entry: For further information, see Figure B.2.

2.1.10

separator efficiency

ability of the aerosol separator or the unit under test to remove contaminant under specified test conditions

2.1.11

optical diameter

optical equivalent diameter

D_o,i

diameter of a particle of the type used to calibrate an optical sizing instrument that scatters the same amount of light as the particle being measured

Note 1 to entry: Optical diameter depends on the instrument, the type of particle used to calibrate the instrument (usually polystyrene latex spheres), and the optical properties of the particle being measured.

2.1.12

aerodynamic diameter

aerodynamic equivalent diameter

D_ae

diameter of a sphere of density 1 g/cm³ with the same terminal velocity due to gravitational force in calm air, as the particle being measured

Note 1 to entry: Annex C provides additional information about aerodynamic diameter.

Note 2 to entry: Aerodynamic diameter depends on the instrument, the type of particle used to calibrate the instrument (usually polystyrene latex spheres), and the properties of the particle being measured.

2.1.13

pressure regulator

device between the outlet of the aerosol separator and air intake to regulate the crankcase pressure in high vacuum conditions

2.1.14

mass oil flow

mass amount of oil per unit time

2.1.15

relief valve

device to direct a portion of the flow around a separation device due to a pressure difference, usually venting to the atmosphere

2.1.16

bypass valve

device to direct a portion of the flow around a separation device due to pressure difference, usually venting downstream of the bypassed separation device

2.1.17

challenge aerosol

output from the aerosol generator or engine which corresponds to the distribution in testing and with the amount of the mass feed rate

Note 1 to entry: The aerosol distribution by mass is prescribed in ISO/TS 17536-2.

2.1.18

particle size

polystyrene latex equivalent size expressed as a diameter in micrometers

2.1.19

isokinetic sampling

sampling in which the flow in the sampler inlet is moving at the same velocity and direction as the flow being sampled

Note 1 to entry: Annex D provides additional information about isokinetic sampling.

2.1.20

particle counter

instrument for sizing and/or counting aerosol particles

Note 1 to entry: Recommended particle counters are optical particle counters (in accordance with ISO 21501-1) or other counters demonstrating good correlation in measuring particle sizes such as aerodynamic particle counters.

2.1.21

coefficient of variation

COV

standard deviation of a group of measurements divided by the mean

2.1.22

unit under test

UUT

either a single aerosol separator element or a complete crankcase ventilation system

2.1.23

open crankcase ventilation

OCV

aerosol separator system that is attached to the crankcase and is vented to the environment

2.1.24

closed crankcase ventilation

CCV

aerosol separator system that is attached between the crankcase and the engine

2.1.25

aerosol separator

device that separates oil from the blowby stream or test stand airstream

2.1.26

high efficiency particulate air filter

HEPA filter

filter having 99,95 % efficiency at most penetrating particle size (class H13 in accordance with EN 1822), or 99,97 % (or higher) fractional efficiency at 0,3 μm using dispersed oil particulate (DOP) aerosol as defined by IEST RP-CC001 recommended practice

2.1.27

inertial separator

device that separates oil from the blowby stream using inertia

2.1.28

combination separator

device that separates oil from the blowby stream using inertia as well as a filter element

2.1.29

rated air flow

flow rate specified by the user or manufacturer

Note 1 to entry: The rated air flow is usually used as the test air flow.

2.1.30

test air flow

measure of the quantity of air pushed or drawn through the aerosol separator per unit time

2.1.31

aerosol generator

laboratory equipment that can produce a simulated blowby particle distribution from oil and compressed air

Note 1 to entry: The aerosol distribution by mass is prescribed in ISO/TS 17536-2.

2.1.32

drainage vessel

device that captures the separated oil from the crankcase separation system, not to include oil carryover

Note 1 to entry: Filter life is not used in all parts of ISO 17536. Life reference is given in Annex E.

2.1.33

mass feed rate

mass amount of challenge aerosol or liquid subjected to the unit under test per unit time

Note 1 to entry: Filter life is not used in all parts of ISO 17536. Life reference is given in Annex E.