Hypergolic ignition modulated by head-on collision, intermixing and convective cooling of binary droplets with varying sizes

Dawei Zhang, Dehai Yu, Peng Zhang, Yueming Yuan, Lianjie Yue, Taichang Zhang, Xuejun Fan

Research output: Journal article publicationJournal articleAcademic researchpeer-review

2 Citations (Scopus)

Abstract

The hypergolic ignition induced by the head-on collision of TMEDA and WFNA droplets was experimentally investigated with emphasis on the effect of droplet size on the ignitibility and the ignition delay time. The ignitibility regime nomogram in We-dO space indicates that the reduction of droplet size tends to suppress the hypergolic ignition. The ignition delay time, which was precisely determined by using grayscale level analysis, becomes shorter for smaller droplets. The seemingly conflicting size effects were resolved by means of time scaling analysis to reveal the size dependence of the three pre-ignition processes, which were identified as the first stage of droplet collision, deformation and intermixing, the second stage of droplet heating from interior to surface, and the third stage of droplet vaporization subject to heat loss by convective cooling.

Original languageEnglish
Pages (from-to)475-481
Number of pages7
JournalInternational Journal of Heat and Mass Transfer
Volume139
DOIs
Publication statusPublished - 1 Aug 2019

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanical Engineering
  • Fluid Flow and Transfer Processes

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