Hello Varad!
Keeping the previous year cutoffs in mind, according to your rank, you can easily get aerospace engineering in main campus. Last year, the closing rank for aerospace engineering in SRM Chennai Campus was 52000. Since your rank is 18032, you can easily get aerospace engineering there. Along with that, if you wish, you can also get Electronics and Communication engineering, electrical and electronics engineering, Information technology engineerig, mechanical engineering. Hope this answer helps.
All the best!