Mass integration of fast-response NO measurements from a two-stroke large-bore natural gas engine

Abstract

A thermodynamic two-stroke-cycle engine simulation with a quasi-steady scavenging model was developed and used to mass-integrate cycle-resolved NO measurements made with a fast-response NO analyser. The engine tested was a Cooper-Bessemer GMV-4TF large-bore natural gas engine and the fast NO measurements were made in cylinders 2 and 4 using a Cambustion fNO_x400 two-channel fast-response analyser. The engine simulation was deemed to provide a good representation of the cycle-resolved scavenging mass flow. The mass-integrated NO results were compared to Fourier transform infrared (FTIR) steady measurements taken downstream of the cylinders 2 and 4 exhaust-manifold junction. The correlation between the two techniques was linear to within 2 per cent. A strong correlation was exhibited between mass-integrated cycle-to-cycle NO and measured peak and crank angle location of peak combustion pressure. The correlation with peak pressure was slightly better than the location of peak pressure.

Keywords

two-stroke large-bore natural gas engine quasi-steady scavenging model fast-response analyser mass integration

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References

Steyskal

Olsen

Willson

Development of PEMS models for predicting NO_x emissions from large bore natural gas engines. In SAE International Spring Fuels and Lubricants, Special Publication SP-1625, Paper 2001-01-1914, 2001.

Munson

B. R.

Young

D. F.

Okiishi

T. H.

Fundamentals of Fluid Mechanics, 3rd edition, 1998 (John Wiley, New York).

Woschni

A universally applicable equation for the instantaneous heat transfer coefficient in the internal combustion engine

SAE Trans., 1968, 76, Paper 670931, 3065–3083.

Heywood

J. B.

Sher

The Two-Stroke Cycle Engine—Its Development Operation and Design, 1999 (Taylor and Francis, Philadelphia, Pennsylvania).

Olsen

D. B.

Hutcherson

G. C.

Willson

B. D.

Mitchell

C. E.

Development of the tracer gas method for large bore natural gas engines: Part 2—measurement of scavenging parameters

J. Engng for Gas Turbines and Power, July 2002, 124 (3), 686–694.

Urban

C. M.

Sharp

C. A.

Computing air/fuel ratio from exhaust composition. In Natural Gas and Alternative Fuels for Engines, 1994, ASME ICE-Vol. 24.

Puzinauskas

P. V.

Mathis

W. M.

Dzieiciuch

M. A.

Quantifying and modeling the effects of thermal shock on combustion pressure transducers

SAE Trans.—J. Engines, 2001, 110 (3), 3491–3503.

Hildenbrand

Schulz

Sick

Josefsson

Magnusson

Andersson

Alden

Laser spectroscopic investigation of flow fields and NO formation in a realistic SI engine

SAE Trans.—J. Engines, 1998, 107.

Baltisberger

Ruhm

Fast NO measuring device for internal combustion engines. SAE Paper 940962, 1994.

10.

Reavell

K. St J.

Collings

Peckham

Hands

Simultaneous fast response NO and HC measurements from a spark ignition engine. SAE Paper 971610, 1997.

11.

Ball

J. K.

Bowe

M. J.

Stone

C. R.

Collings

Validation of a cyclic NO formation model with fast NO measurements. SAE Paper 2001-01-1010, 2001.

12.

Olsen

D. B.

Hutcherson

G. C.

Willson

B. D.

Mitchell

C. E.

Development of the tracer gas method for large bore natural gas engines: Part 1—method validation

J. Engng for Gas Turbines and Power, July 2002, 124 (3), 678–685.