Design and Performance Test of a Lab-Made Single-Stage Low-Pressure Impactor for Morphology Analysis of Diesel Exhaust Particles

Figures & data

FIG. 1. Schematics of experimental apparatus for (a) performance test and (b) diesel engine test.

TABLE 1 Specifications of test engines 1 and 2

	Engine 1	Engine 2
Engine model	2.2 MAGMA diesel engine	RSI 090 research engine
Engine type	Four-cylinder	Single-cylinder
Injection system	Mechanical fuel injection	Common rail diesel injection
Bore × stroke (mm)	86 × 94	83 × 92
Displacement volume (L)	2.184	0.498
Stroke × bore (mm)	94 × 86	92 × 83
Compression ratio	22.9:1	19.5:1

FIG. 2. Experimental and simulated collection efficiencies of the impactor for NaCl particles.

FIG. 3. Log-log plot of mobility diameter versus aerodynamic diameter.

FIG. 4. Effective density distributions of diesel exhaust particles.

TABLE 2 Size distributions of particles from test engines (number of repetition = 3)

	Engine 1	Engine 2
Geometric mean diameter (nm)	92	221.1
Geometric standard deviation	1.47	1.52
Total number concentration (particles/cm^3)	2.18 × 10^6	1.78×10^6

FIG. 5. Dynamic shape factors of diesel exhaust particles.