Diesel Aerosol Measurement - Department of Mechanical ...

6. Temperature of exhaust at the inlet of the primary dilution tunnel
Laboratory Response
AEA Not measured
Biel 450 o C max
EMPA Not measured
MTU Tailpipe: 270-400 o C, Tunnel inlet: 190 - 300 o C, Dilution air: 20 - 27 o C
FEV The temperature is different and depend on test condition (vehicle/engine type, velocity). For
diesel vehicle max. 300 °C.
Ford Not measured
EPCD Not measured
UMN New Tunnel: Exhaust Temperature
Old Tunnel: 300 °C
7. Physical characteristics of the primary dilution tunnel
Laboratory Response
AEA The primary dilution tunnel is constructed of smooth bore stainless steel, 22 cm ID by 2.5 m
long. The tunnel is earthed and the particulate sizing sampling point is ~2.2 m downstream of
the tunnel entrance.
Biel AVL Smart Sampler 2, Model 472, partial flow system; Tunnel diameter: 70 mm, length 700 mm
EMPA Chassis:
• construction material: stainless steel,
• electrical grounding: yes
• inner diameter: ≈ 320 mm
• length: ≈ 4000 mm
• sampling about 4 m downstream of the mixing point
Engine Dyno:
• construction material: stainless steel,
• electrical grounding: yes
• inner diameter: ≈ 450 mm
• length: ≈ 5000 mm
• sampling about 4.6 m downstream of the mixing point
MTU 16 gauge 304 stainless steel, diameter = 0.305 m, distance from exhaust inlet to sampling
location is 4.57 m
FEV The construction material consists of straight stainless steel and an electrical grounding. The
inner diameter of the dilution tunnel is 320 mm, and its length is 4 m.
Ford *
EPCD construction material: stainless steel
electrical grounding: yes
inner diameter: 18 inches
length: 13.8 feet
UMN New tunnel: Stainless steel probe with a short transfer line connected t o a critical orifice
upstream of an ejector pump model Air Vac TD110SS
Old tunnel: same as above with a longer heated and insulated transfer line
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