Exploration of the ion current method universality and online combustion monitoring. (1st December 2022)

• Record Type: Journal Article
• Authors: Li, Yaxin; Gao, Zhongquan; Wu, Haoxuan; Feng, Pengcheng; Li, Yutong; Tan, Yonghua; Du, Feiping; Bi, Peng
• Is Part Of: Fuel. Volume 329(2022)
• Publication Date: 2022-12-01
• Subjects: Premixed laminar combustion -- Ion current method -- Flame propagation speed -- Combustion monitoring; Fuel -- Periodicals; Coal -- Periodicals; Coal; Fuel; Periodicals; 662.6
• DOI: 10.1016/j.fuel.2022.125366
• Languages: English
• ISSNs: 0016-2361

Abstract

Highlights: The ion current signals are collected simultaneously from different locations using multiple probe pairs, showing a high degree of consistency, and any probe signal can be used to characterize the entire combustion process. Simultaneous sampling of ion current signals using different structure probes. The spherical flame ion current signal is a key function of time and positively correlates with flame propagation speed. The probe collects the ion current signal of the whole combustion process, which is more timely and significant than the pressure signal. The formation of the second ion current peak is explained by combining the density field and the return cyclone. Abstract: To verify the universality of the ion current method, a new structure of ion current probe was employed and improved with the cavity structure of the constant volume combustion bomb to diagnose CH4 /air premixed laminar combustion. The experiments were conducted in a constant volume combustion bomb at 0.1 MPa with excess air factors ranging from 0.9 to 1.45, and six sets of probes were used to obtain ion current signals simultaneously. Results show that the signals collected by the ion current probes installed at different locations exhibited high consistency. And the ion current signal can be used to monitor the combustion process online. Moreover, it provides a more timely and significant characterization of parameters, such as ignition moment and flame propagation phase, than pressure signal. It can be a new idea for real-time acquisition of flame propagation velocity.