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Abstract

Temperature is one of the important parameters to measure the combustion efficiency. The measurement of temperature is of great significance for saving energy and reducing emission in industrial combustion process and diagnosing the engine state. The tunable diode laser absorption spectroscopy is a non-invasive measurement technology with strong environmental adaptability for fast, in-situ detection. Based on the three absorption lines of H ₂O at 7185.6 cm ^–1, 6807.8 cm ^–1and 7444.35/37 cm ^–1, the wavelength modulated spectrum absorption model is established and laboratory-calibrated; using the background-subtracting WMS-2f/1f method and the best fit method, the temperature is measured. The outlet temperature of the single-head combustion chamber is accurately realized. The outlet temperature of the single-sector combustion chamber is also accurately measured. The measurement is verified in a pressure range of 3.39－10.58 atm and a temperature range of 958－1512 K. The time resolution of the measurement system is less than 1 ms, and the measurement error is less than 5.68%, thus verifying the practicality of the measurement method and the stability of the measurement system.

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Authors and contacts

Corresponding author:Kan Rui-Feng,kanruifeng@aiofm.ac.cn

Funds:Project supported by the National Key Research and Development Program of China (Grant No. 2016YFC0201104)

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${\upsilon _0}$/cm^–1	$S({T_0})$@296 K/cm^–2·atm^–1	E''/cm^–1	γ_air0/cm^–1·atm^–1	γ_self/cm^–1·atm^–1
7185.60	1.91 × 10^–2	1045.06	0.041	0.198
6807.83	6.03 × 10^–6	3319.45	0.098	0.183
7444.35/37	1.10 × 10^–3	1774/1806	0.019/0.0153	0.2/0.23

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State	Pressure/atm	Flow/kg·s^–1	Average temperature/K
1	3.49	0.511	958
2	7.04	0.997	1420
3	10.58	1.48	1512

DownLoad: CSV

	State & illustrate	State 1	State 2	State 3
First group	Average temperature/K	975.41	1481.29	1596.33
	Absolute error/K	17.41	61.29	84.33
	Relative error/%	1.82	4.32	5.58
Second group	Average temperature/K	980.57	1473.66	1595.77
	Absolute error/K	22.57	53.66	83.77
	Relative error/%	2.36	3.78	5.54
Third group	Average temperature/K	982.91	1481.46	1601.50
	Absolute error/K	24.91	61.46	89.50
	Relative error/%	2.60	4.33	5.92
Total	Average temperature/K	979.63	1478.80	1597.87
	Absolute error/K	21.63	58.80	85.87
	Relative error/%	2.26	4.14	5.68

DownLoad: CSV

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Vol. 68, Issue 23 - 2019-12-05

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